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e1b2f459e2
It's used only there. Signed-off-by: Thiago Farina <tfransosi@gmail.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1006 lines
20 KiB
C
1006 lines
20 KiB
C
/* eval.c
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*
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* Expression evaluation functions
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*
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* written 1986 by Daniel Lawrence
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* modified by Petri Kutvonen
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*/
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#include <stdio.h>
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#include "estruct.h"
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#include "edef.h"
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#include "efunc.h"
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#include "evar.h"
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#include "line.h"
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#include "util.h"
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#include "version.h"
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#define MAXVARS 255
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/* User variables */
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static struct user_variable uv[MAXVARS + 1];
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/* Initialize the user variable list. */
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void varinit(void)
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{
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int i;
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for (i = 0; i < MAXVARS; i++)
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uv[i].u_name[0] = 0;
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}
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/*
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* Evaluate a function.
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*
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* @fname: name of function to evaluate.
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*/
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char *gtfun(char *fname)
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{
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int fnum; /* index to function to eval */
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int status; /* return status */
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char *tsp; /* temporary string pointer */
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char arg1[NSTRING]; /* value of first argument */
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char arg2[NSTRING]; /* value of second argument */
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char arg3[NSTRING]; /* value of third argument */
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static char result[2 * NSTRING]; /* string result */
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/* look the function up in the function table */
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fname[3] = 0; /* only first 3 chars significant */
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mklower(fname); /* and let it be upper or lower case */
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for (fnum = 0; fnum < ARRAY_SIZE(funcs); fnum++)
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if (strcmp(fname, funcs[fnum].f_name) == 0)
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break;
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/* return errorm on a bad reference */
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if (fnum == ARRAY_SIZE(funcs))
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return errorm;
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/* if needed, retrieve the first argument */
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if (funcs[fnum].f_type >= MONAMIC) {
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if ((status = macarg(arg1)) != TRUE)
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return errorm;
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/* if needed, retrieve the second argument */
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if (funcs[fnum].f_type >= DYNAMIC) {
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if ((status = macarg(arg2)) != TRUE)
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return errorm;
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/* if needed, retrieve the third argument */
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if (funcs[fnum].f_type >= TRINAMIC)
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if ((status = macarg(arg3)) != TRUE)
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return errorm;
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}
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}
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/* and now evaluate it! */
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switch (fnum) {
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case UFADD:
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return itoa(atoi(arg1) + atoi(arg2));
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case UFSUB:
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return itoa(atoi(arg1) - atoi(arg2));
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case UFTIMES:
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return itoa(atoi(arg1) * atoi(arg2));
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case UFDIV:
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return itoa(atoi(arg1) / atoi(arg2));
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case UFMOD:
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return itoa(atoi(arg1) % atoi(arg2));
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case UFNEG:
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return itoa(-atoi(arg1));
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case UFCAT:
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strcpy(result, arg1);
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return strcat(result, arg2);
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case UFLEFT:
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return strncpy(result, arg1, atoi(arg2));
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case UFRIGHT:
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return (strcpy(result,
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&arg1[(strlen(arg1) - atoi(arg2))]));
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case UFMID:
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return (strncpy(result, &arg1[atoi(arg2) - 1],
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atoi(arg3)));
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case UFNOT:
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return ltos(stol(arg1) == FALSE);
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case UFEQUAL:
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return ltos(atoi(arg1) == atoi(arg2));
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case UFLESS:
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return ltos(atoi(arg1) < atoi(arg2));
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case UFGREATER:
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return ltos(atoi(arg1) > atoi(arg2));
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case UFSEQUAL:
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return ltos(strcmp(arg1, arg2) == 0);
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case UFSLESS:
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return ltos(strcmp(arg1, arg2) < 0);
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case UFSGREAT:
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return ltos(strcmp(arg1, arg2) > 0);
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case UFIND:
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return strcpy(result, getval(arg1));
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case UFAND:
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return ltos(stol(arg1) && stol(arg2));
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case UFOR:
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return ltos(stol(arg1) || stol(arg2));
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case UFLENGTH:
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return itoa(strlen(arg1));
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case UFUPPER:
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return mkupper(arg1);
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case UFLOWER:
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return mklower(arg1);
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case UFTRUTH:
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return ltos(atoi(arg1) == 42);
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case UFASCII:
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return itoa((int) arg1[0]);
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case UFCHR:
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result[0] = atoi(arg1);
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result[1] = 0;
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return result;
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case UFGTKEY:
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result[0] = tgetc();
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result[1] = 0;
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return result;
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case UFRND:
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return itoa((ernd() % abs(atoi(arg1))) + 1);
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case UFABS:
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return itoa(abs(atoi(arg1)));
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case UFSINDEX:
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return itoa(sindex(arg1, arg2));
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case UFENV:
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#if ENVFUNC
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tsp = getenv(arg1);
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return tsp == NULL ? "" : tsp;
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#else
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return "";
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#endif
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case UFBIND:
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return transbind(arg1);
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case UFEXIST:
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return ltos(fexist(arg1));
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case UFFIND:
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tsp = flook(arg1, TRUE);
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return tsp == NULL ? "" : tsp;
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case UFBAND:
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return itoa(atoi(arg1) & atoi(arg2));
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case UFBOR:
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return itoa(atoi(arg1) | atoi(arg2));
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case UFBXOR:
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return itoa(atoi(arg1) ^ atoi(arg2));
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case UFBNOT:
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return itoa(~atoi(arg1));
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case UFXLATE:
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return xlat(arg1, arg2, arg3);
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}
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exit(-11); /* never should get here */
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}
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/*
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* look up a user var's value
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*
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* char *vname; name of user variable to fetch
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*/
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char *gtusr(char *vname)
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{
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int vnum; /* ordinal number of user var */
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/* scan the list looking for the user var name */
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for (vnum = 0; vnum < MAXVARS; vnum++) {
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if (uv[vnum].u_name[0] == 0)
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return errorm;
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if (strcmp(vname, uv[vnum].u_name) == 0)
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return uv[vnum].u_value;
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}
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/* return errorm if we run off the end */
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return errorm;
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}
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extern char *getkill(void);
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/*
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* gtenv()
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*
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* char *vname; name of environment variable to retrieve
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*/
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char *gtenv(char *vname)
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{
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int vnum; /* ordinal number of var refrenced */
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/* scan the list, looking for the referenced name */
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for (vnum = 0; vnum < ARRAY_SIZE(envars); vnum++)
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if (strcmp(vname, envars[vnum]) == 0)
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break;
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/* return errorm on a bad reference */
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if (vnum == ARRAY_SIZE(envars))
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#if ENVFUNC
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{
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char *ename = getenv(vname);
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if (ename != NULL)
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return ename;
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else
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return errorm;
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}
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#else
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return errorm;
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#endif
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/* otherwise, fetch the appropriate value */
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switch (vnum) {
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case EVFILLCOL:
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return itoa(fillcol);
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case EVPAGELEN:
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return itoa(term.t_nrow + 1);
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case EVCURCOL:
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return itoa(getccol(FALSE));
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case EVCURLINE:
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return itoa(getcline());
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case EVRAM:
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return itoa((int) (envram / 1024l));
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case EVFLICKER:
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return ltos(flickcode);
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case EVCURWIDTH:
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return itoa(term.t_ncol);
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case EVCBUFNAME:
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return curbp->b_bname;
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case EVCFNAME:
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return curbp->b_fname;
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case EVSRES:
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return sres;
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case EVDEBUG:
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return ltos(macbug);
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case EVSTATUS:
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return ltos(cmdstatus);
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case EVPALETTE:
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return palstr;
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case EVASAVE:
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return itoa(gasave);
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case EVACOUNT:
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return itoa(gacount);
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case EVLASTKEY:
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return itoa(lastkey);
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case EVCURCHAR:
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return (curwp->w_dotp->l_used ==
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curwp->w_doto ? itoa('\n') :
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itoa(lgetc(curwp->w_dotp, curwp->w_doto)));
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case EVDISCMD:
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return ltos(discmd);
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case EVVERSION:
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return VERSION;
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case EVPROGNAME:
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return PROGRAM_NAME_LONG;
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case EVSEED:
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return itoa(seed);
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case EVDISINP:
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return ltos(disinp);
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case EVWLINE:
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return itoa(curwp->w_ntrows);
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case EVCWLINE:
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return itoa(getwpos());
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case EVTARGET:
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saveflag = lastflag;
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return itoa(curgoal);
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case EVSEARCH:
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return pat;
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case EVREPLACE:
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return rpat;
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case EVMATCH:
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return (patmatch == NULL) ? "" : patmatch;
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case EVKILL:
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return getkill();
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case EVCMODE:
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return itoa(curbp->b_mode);
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case EVGMODE:
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return itoa(gmode);
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case EVTPAUSE:
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return itoa(term.t_pause);
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case EVPENDING:
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#if TYPEAH
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return ltos(typahead());
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#else
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return falsem;
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#endif
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case EVLWIDTH:
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return itoa(llength(curwp->w_dotp));
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case EVLINE:
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return getctext();
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case EVGFLAGS:
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return itoa(gflags);
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case EVRVAL:
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return itoa(rval);
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case EVTAB:
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return itoa(tabmask + 1);
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case EVOVERLAP:
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return itoa(overlap);
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case EVSCROLLCOUNT:
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return itoa(scrollcount);
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#if SCROLLCODE
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case EVSCROLL:
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return ltos(term.t_scroll != NULL);
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#else
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case EVSCROLL:
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return ltos(0);
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#endif
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}
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exit(-12); /* again, we should never get here */
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}
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/*
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* return some of the contents of the kill buffer
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*/
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char *getkill(void)
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{
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int size; /* max number of chars to return */
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static char value[NSTRING]; /* temp buffer for value */
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if (kbufh == NULL)
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/* no kill buffer....just a null string */
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value[0] = 0;
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else {
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/* copy in the contents... */
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if (kused < NSTRING)
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size = kused;
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else
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size = NSTRING - 1;
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strncpy(value, kbufh->d_chunk, size);
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}
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/* and return the constructed value */
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return value;
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}
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/*
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* set a variable
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*
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* int f; default flag
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* int n; numeric arg (can overide prompted value)
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*/
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int setvar(int f, int n)
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{
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int status; /* status return */
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#if DEBUGM
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char *sp; /* temp string pointer */
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char *ep; /* ptr to end of outline */
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#endif
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struct variable_description vd; /* variable num/type */
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char var[NVSIZE + 1]; /* name of variable to fetch */
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char value[NSTRING]; /* value to set variable to */
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/* first get the variable to set.. */
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if (clexec == FALSE) {
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status = mlreply("Variable to set: ", &var[0], NVSIZE);
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if (status != TRUE)
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return status;
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} else { /* macro line argument */
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/* grab token and skip it */
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execstr = token(execstr, var, NVSIZE + 1);
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}
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/* check the legality and find the var */
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findvar(var, &vd, NVSIZE + 1);
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/* if its not legal....bitch */
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if (vd.v_type == -1) {
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mlwrite("%%No such variable as '%s'", var);
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return FALSE;
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}
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/* get the value for that variable */
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if (f == TRUE)
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strcpy(value, itoa(n));
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else {
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status = mlreply("Value: ", &value[0], NSTRING);
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if (status != TRUE)
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return status;
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}
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/* and set the appropriate value */
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status = svar(&vd, value);
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#if DEBUGM
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/* if $debug == TRUE, every assignment will echo a statment to
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that effect here. */
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if (macbug) {
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strcpy(outline, "(((");
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/* assignment status */
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strcat(outline, ltos(status));
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strcat(outline, ":");
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/* variable name */
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strcat(outline, var);
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strcat(outline, ":");
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/* and lastly the value we tried to assign */
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strcat(outline, value);
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strcat(outline, ")))");
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/* expand '%' to "%%" so mlwrite wont bitch */
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sp = outline;
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while (*sp)
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if (*sp++ == '%') {
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/* advance to the end */
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ep = --sp;
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while (*ep++);
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/* null terminate the string one out */
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*(ep + 1) = 0;
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/* copy backwards */
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while (ep-- > sp)
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*(ep + 1) = *ep;
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/* and advance sp past the new % */
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sp += 2;
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}
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/* write out the debug line */
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mlforce(outline);
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update(TRUE);
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/* and get the keystroke to hold the output */
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if (get1key() == abortc) {
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mlforce("(Macro aborted)");
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status = FALSE;
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}
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}
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#endif
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/* and return it */
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return status;
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}
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/*
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* Find a variables type and name.
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*
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* @var: name of variable to get.
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* @vd: structure to hold type and pointer.
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* @size: size of variable array.
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*/
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void findvar(char *var, struct variable_description *vd, int size)
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{
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int vnum; /* subscript in variable arrays */
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int vtype; /* type to return */
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vnum = -1;
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fvar:
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vtype = -1;
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switch (var[0]) {
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case '$': /* check for legal enviromnent var */
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for (vnum = 0; vnum < ARRAY_SIZE(envars); vnum++)
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if (strcmp(&var[1], envars[vnum]) == 0) {
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vtype = TKENV;
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break;
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}
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break;
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case '%': /* check for existing legal user variable */
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for (vnum = 0; vnum < MAXVARS; vnum++)
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if (strcmp(&var[1], uv[vnum].u_name) == 0) {
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vtype = TKVAR;
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break;
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}
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if (vnum < MAXVARS)
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break;
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/* create a new one??? */
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for (vnum = 0; vnum < MAXVARS; vnum++)
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if (uv[vnum].u_name[0] == 0) {
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vtype = TKVAR;
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strcpy(uv[vnum].u_name, &var[1]);
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break;
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}
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break;
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case '&': /* indirect operator? */
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var[4] = 0;
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if (strcmp(&var[1], "ind") == 0) {
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/* grab token, and eval it */
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execstr = token(execstr, var, size);
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strcpy(var, getval(var));
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goto fvar;
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}
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}
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/* return the results */
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vd->v_num = vnum;
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vd->v_type = vtype;
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return;
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}
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/*
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* Set a variable.
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*
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* @var: variable to set.
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* @value: value to set to.
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*/
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int svar(struct variable_description *var, char *value)
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{
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int vnum; /* ordinal number of var refrenced */
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int vtype; /* type of variable to set */
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int status; /* status return */
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int c; /* translated character */
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char *sp; /* scratch string pointer */
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/* simplify the vd structure (we are gonna look at it a lot) */
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vnum = var->v_num;
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vtype = var->v_type;
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/* and set the appropriate value */
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status = TRUE;
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switch (vtype) {
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case TKVAR: /* set a user variable */
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if (uv[vnum].u_value != NULL)
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free(uv[vnum].u_value);
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sp = malloc(strlen(value) + 1);
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if (sp == NULL)
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return FALSE;
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strcpy(sp, value);
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uv[vnum].u_value = sp;
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break;
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case TKENV: /* set an environment variable */
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status = TRUE; /* by default */
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switch (vnum) {
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case EVFILLCOL:
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fillcol = atoi(value);
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break;
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case EVPAGELEN:
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status = newsize(TRUE, atoi(value));
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break;
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case EVCURCOL:
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status = setccol(atoi(value));
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break;
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case EVCURLINE:
|
|
status = gotoline(TRUE, atoi(value));
|
|
break;
|
|
case EVRAM:
|
|
break;
|
|
case EVFLICKER:
|
|
flickcode = stol(value);
|
|
break;
|
|
case EVCURWIDTH:
|
|
status = newwidth(TRUE, atoi(value));
|
|
break;
|
|
case EVCBUFNAME:
|
|
strcpy(curbp->b_bname, value);
|
|
curwp->w_flag |= WFMODE;
|
|
break;
|
|
case EVCFNAME:
|
|
strcpy(curbp->b_fname, value);
|
|
curwp->w_flag |= WFMODE;
|
|
break;
|
|
case EVSRES:
|
|
status = TTrez(value);
|
|
break;
|
|
case EVDEBUG:
|
|
macbug = stol(value);
|
|
break;
|
|
case EVSTATUS:
|
|
cmdstatus = stol(value);
|
|
break;
|
|
case EVASAVE:
|
|
gasave = atoi(value);
|
|
break;
|
|
case EVACOUNT:
|
|
gacount = atoi(value);
|
|
break;
|
|
case EVLASTKEY:
|
|
lastkey = atoi(value);
|
|
break;
|
|
case EVCURCHAR:
|
|
ldelete(1L, FALSE); /* delete 1 char */
|
|
c = atoi(value);
|
|
if (c == '\n')
|
|
lnewline();
|
|
else
|
|
linsert(1, c);
|
|
backchar(FALSE, 1);
|
|
break;
|
|
case EVDISCMD:
|
|
discmd = stol(value);
|
|
break;
|
|
case EVVERSION:
|
|
break;
|
|
case EVPROGNAME:
|
|
break;
|
|
case EVSEED:
|
|
seed = atoi(value);
|
|
break;
|
|
case EVDISINP:
|
|
disinp = stol(value);
|
|
break;
|
|
case EVWLINE:
|
|
status = resize(TRUE, atoi(value));
|
|
break;
|
|
case EVCWLINE:
|
|
status = forwline(TRUE, atoi(value) - getwpos());
|
|
break;
|
|
case EVTARGET:
|
|
curgoal = atoi(value);
|
|
thisflag = saveflag;
|
|
break;
|
|
case EVSEARCH:
|
|
strcpy(pat, value);
|
|
rvstrcpy(tap, pat);
|
|
#if MAGIC
|
|
mcclear();
|
|
#endif
|
|
break;
|
|
case EVREPLACE:
|
|
strcpy(rpat, value);
|
|
break;
|
|
case EVMATCH:
|
|
break;
|
|
case EVKILL:
|
|
break;
|
|
case EVCMODE:
|
|
curbp->b_mode = atoi(value);
|
|
curwp->w_flag |= WFMODE;
|
|
break;
|
|
case EVGMODE:
|
|
gmode = atoi(value);
|
|
break;
|
|
case EVTPAUSE:
|
|
term.t_pause = atoi(value);
|
|
break;
|
|
case EVPENDING:
|
|
break;
|
|
case EVLWIDTH:
|
|
break;
|
|
case EVLINE:
|
|
putctext(value);
|
|
case EVGFLAGS:
|
|
gflags = atoi(value);
|
|
break;
|
|
case EVRVAL:
|
|
break;
|
|
case EVTAB:
|
|
tabmask = atoi(value) - 1;
|
|
if (tabmask != 0x07 && tabmask != 0x03)
|
|
tabmask = 0x07;
|
|
curwp->w_flag |= WFHARD;
|
|
break;
|
|
case EVOVERLAP:
|
|
overlap = atoi(value);
|
|
break;
|
|
case EVSCROLLCOUNT:
|
|
scrollcount = atoi(value);
|
|
break;
|
|
case EVSCROLL:
|
|
#if SCROLLCODE
|
|
if (!stol(value))
|
|
term.t_scroll = NULL;
|
|
#endif
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* itoa:
|
|
* integer to ascii string.......... This is too
|
|
* inconsistant to use the system's
|
|
*
|
|
* int i; integer to translate to a string
|
|
*/
|
|
char *itoa(int i)
|
|
{
|
|
int digit; /* current digit being used */
|
|
char *sp; /* pointer into result */
|
|
int sign; /* sign of resulting number */
|
|
static char result[INTWIDTH + 1]; /* resulting string */
|
|
|
|
/* record the sign... */
|
|
sign = 1;
|
|
if (i < 0) {
|
|
sign = -1;
|
|
i = -i;
|
|
}
|
|
|
|
/* and build the string (backwards!) */
|
|
sp = result + INTWIDTH;
|
|
*sp = 0;
|
|
do {
|
|
digit = i % 10;
|
|
*(--sp) = '0' + digit; /* and install the new digit */
|
|
i = i / 10;
|
|
} while (i);
|
|
|
|
/* and fix the sign */
|
|
if (sign == -1) {
|
|
*(--sp) = '-'; /* and install the minus sign */
|
|
}
|
|
|
|
return sp;
|
|
}
|
|
|
|
/*
|
|
* find the type of a passed token
|
|
*
|
|
* char *token; token to analyze
|
|
*/
|
|
int gettyp(char *token)
|
|
{
|
|
char c; /* first char in token */
|
|
|
|
/* grab the first char (this is all we need) */
|
|
c = *token;
|
|
|
|
/* no blanks!!! */
|
|
if (c == 0)
|
|
return TKNUL;
|
|
|
|
/* a numeric literal? */
|
|
if (c >= '0' && c <= '9')
|
|
return TKLIT;
|
|
|
|
switch (c) {
|
|
case '"':
|
|
return TKSTR;
|
|
|
|
case '!':
|
|
return TKDIR;
|
|
case '@':
|
|
return TKARG;
|
|
case '#':
|
|
return TKBUF;
|
|
case '$':
|
|
return TKENV;
|
|
case '%':
|
|
return TKVAR;
|
|
case '&':
|
|
return TKFUN;
|
|
case '*':
|
|
return TKLBL;
|
|
|
|
default:
|
|
return TKCMD;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* find the value of a token
|
|
*
|
|
* char *token; token to evaluate
|
|
*/
|
|
char *getval(char *token)
|
|
{
|
|
int status; /* error return */
|
|
struct buffer *bp; /* temp buffer pointer */
|
|
int blen; /* length of buffer argument */
|
|
int distmp; /* temporary discmd flag */
|
|
static char buf[NSTRING]; /* string buffer for some returns */
|
|
|
|
switch (gettyp(token)) {
|
|
case TKNUL:
|
|
return "";
|
|
|
|
case TKARG: /* interactive argument */
|
|
strcpy(token, getval(&token[1]));
|
|
distmp = discmd; /* echo it always! */
|
|
discmd = TRUE;
|
|
status = getstring(token, buf, NSTRING, ctoec('\n'));
|
|
discmd = distmp;
|
|
if (status == ABORT)
|
|
return errorm;
|
|
return buf;
|
|
|
|
case TKBUF: /* buffer contents fetch */
|
|
|
|
/* grab the right buffer */
|
|
strcpy(token, getval(&token[1]));
|
|
bp = bfind(token, FALSE, 0);
|
|
if (bp == NULL)
|
|
return errorm;
|
|
|
|
/* if the buffer is displayed, get the window
|
|
vars instead of the buffer vars */
|
|
if (bp->b_nwnd > 0) {
|
|
curbp->b_dotp = curwp->w_dotp;
|
|
curbp->b_doto = curwp->w_doto;
|
|
}
|
|
|
|
/* make sure we are not at the end */
|
|
if (bp->b_linep == bp->b_dotp)
|
|
return errorm;
|
|
|
|
/* grab the line as an argument */
|
|
blen = bp->b_dotp->l_used - bp->b_doto;
|
|
if (blen > NSTRING)
|
|
blen = NSTRING;
|
|
strncpy(buf, bp->b_dotp->l_text + bp->b_doto, blen);
|
|
buf[blen] = 0;
|
|
|
|
/* and step the buffer's line ptr ahead a line */
|
|
bp->b_dotp = bp->b_dotp->l_fp;
|
|
bp->b_doto = 0;
|
|
|
|
/* if displayed buffer, reset window ptr vars */
|
|
if (bp->b_nwnd > 0) {
|
|
curwp->w_dotp = curbp->b_dotp;
|
|
curwp->w_doto = 0;
|
|
curwp->w_flag |= WFMOVE;
|
|
}
|
|
|
|
/* and return the spoils */
|
|
return buf;
|
|
|
|
case TKVAR:
|
|
return gtusr(token + 1);
|
|
case TKENV:
|
|
return gtenv(token + 1);
|
|
case TKFUN:
|
|
return gtfun(token + 1);
|
|
case TKDIR:
|
|
return errorm;
|
|
case TKLBL:
|
|
return errorm;
|
|
case TKLIT:
|
|
return token;
|
|
case TKSTR:
|
|
return token + 1;
|
|
case TKCMD:
|
|
return token;
|
|
}
|
|
return errorm;
|
|
}
|
|
|
|
/*
|
|
* convert a string to a numeric logical
|
|
*
|
|
* char *val; value to check for stol
|
|
*/
|
|
int stol(char *val)
|
|
{
|
|
/* check for logical values */
|
|
if (val[0] == 'F')
|
|
return FALSE;
|
|
if (val[0] == 'T')
|
|
return TRUE;
|
|
|
|
/* check for numeric truth (!= 0) */
|
|
return (atoi(val) != 0);
|
|
}
|
|
|
|
/*
|
|
* numeric logical to string logical
|
|
*
|
|
* int val; value to translate
|
|
*/
|
|
char *ltos(int val)
|
|
{
|
|
if (val)
|
|
return truem;
|
|
else
|
|
return falsem;
|
|
}
|
|
|
|
/*
|
|
* make a string upper case
|
|
*
|
|
* char *str; string to upper case
|
|
*/
|
|
char *mkupper(char *str)
|
|
{
|
|
char *sp;
|
|
|
|
sp = str;
|
|
while (*sp) {
|
|
if ('a' <= *sp && *sp <= 'z')
|
|
*sp += 'A' - 'a';
|
|
++sp;
|
|
}
|
|
return str;
|
|
}
|
|
|
|
/*
|
|
* make a string lower case
|
|
*
|
|
* char *str; string to lower case
|
|
*/
|
|
char *mklower(char *str)
|
|
{
|
|
char *sp;
|
|
|
|
sp = str;
|
|
while (*sp) {
|
|
if ('A' <= *sp && *sp <= 'Z')
|
|
*sp += 'a' - 'A';
|
|
++sp;
|
|
}
|
|
return str;
|
|
}
|
|
|
|
/*
|
|
* take the absolute value of an integer
|
|
*/
|
|
int abs(int x)
|
|
{
|
|
return x < 0 ? -x : x;
|
|
}
|
|
|
|
/*
|
|
* returns a random integer
|
|
*/
|
|
int ernd(void)
|
|
{
|
|
seed = abs(seed * 1721 + 10007);
|
|
return seed;
|
|
}
|
|
|
|
/*
|
|
* find pattern within source
|
|
*
|
|
* char *source; source string to search
|
|
* char *pattern; string to look for
|
|
*/
|
|
int sindex(char *source, char *pattern)
|
|
{
|
|
char *sp; /* ptr to current position to scan */
|
|
char *csp; /* ptr to source string during comparison */
|
|
char *cp; /* ptr to place to check for equality */
|
|
|
|
/* scanning through the source string */
|
|
sp = source;
|
|
while (*sp) {
|
|
/* scan through the pattern */
|
|
cp = pattern;
|
|
csp = sp;
|
|
while (*cp) {
|
|
if (!eq(*cp, *csp))
|
|
break;
|
|
++cp;
|
|
++csp;
|
|
}
|
|
|
|
/* was it a match? */
|
|
if (*cp == 0)
|
|
return (int) (sp - source) + 1;
|
|
++sp;
|
|
}
|
|
|
|
/* no match at all.. */
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Filter a string through a translation table
|
|
*
|
|
* char *source; string to filter
|
|
* char *lookup; characters to translate
|
|
* char *trans; resulting translated characters
|
|
*/
|
|
char *xlat(char *source, char *lookup, char *trans)
|
|
{
|
|
char *sp; /* pointer into source table */
|
|
char *lp; /* pointer into lookup table */
|
|
char *rp; /* pointer into result */
|
|
static char result[NSTRING]; /* temporary result */
|
|
|
|
/* scan source string */
|
|
sp = source;
|
|
rp = result;
|
|
while (*sp) {
|
|
/* scan lookup table for a match */
|
|
lp = lookup;
|
|
while (*lp) {
|
|
if (*sp == *lp) {
|
|
*rp++ = trans[lp - lookup];
|
|
goto xnext;
|
|
}
|
|
++lp;
|
|
}
|
|
|
|
/* no match, copy in the source char untranslated */
|
|
*rp++ = *sp;
|
|
|
|
xnext:++sp;
|
|
}
|
|
|
|
/* terminate and return the result */
|
|
*rp = 0;
|
|
return result;
|
|
}
|