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uemacs/eval.c

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/* eval.c -- implements eval.h */
#include "eval.h"
/* eval.c
*
* Expression evaluation functions
*
* written 1986 by Daniel Lawrence
* modified by Petri Kutvonen
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "basic.h"
#include "bind.h"
#include "buffer.h"
#include "display.h"
#include "estruct.h"
#include "globals.h"
#include "exec.h"
#include "execute.h"
#include "flook.h"
#include "input.h"
#include "line.h"
#include "random.h"
#include "search.h"
#include "terminal.h"
#include "termio.h"
#include "version.h"
#include "window.h"
#define MAXVARS 255
#define ARRAY_SIZE(a) (sizeof(a) / sizeof(a[0]))
#if DEBUGM
/* vars needed for macro debugging output */
char outline[ NSTRING] ; /* global string to hold debug line text */
#endif
int gflags = GFREAD ; /* global control flag */
int macbug = FALSE ; /* macro debuging flag */
int cmdstatus = TRUE ; /* last command status */
int flickcode = FALSE ; /* do flicker supression? */
static int saveflag = 0 ; /* Flags, saved with the $target var */
long envram = 0l ; /* # of bytes current in use by malloc */
/* Max #chars in a var name. */
#define NVSIZE 10
/* Structure to hold user variables and their definitions. */
struct user_variable {
char u_name[NVSIZE + 1]; /* name of user variable */
char *u_value; /* value (string) */
};
static char errorm[] = "ERROR" ; /* error literal */
static int seed = 0 ; /* random number seed */
static char *ltos( int val) ;
/* List of recognized environment variables. */
static const char *envars[] = {
"fillcol", /* current fill column */
"pagelen", /* number of lines used by editor */
"curcol", /* current column pos of cursor */
"curline", /* current line in file */
"ram", /* ram in use by malloc */
"flicker", /* flicker supression */
"curwidth", /* current screen width */
"cbufname", /* current buffer name */
"cfname", /* current file name */
"sres", /* current screen resolution */
"debug", /* macro debugging */
"status", /* returns the status of the last command */
"palette", /* current palette string */
"asave", /* # of chars between auto-saves */
"acount", /* # of chars until next auto-save */
"lastkey", /* last keyboard char struck */
"curchar", /* current character under the cursor */
"discmd", /* display commands on command line */
"version", /* current version number */
"progname", /* returns current prog name - "MicroEMACS" */
"seed", /* current random number seed */
"disinp", /* display command line input characters */
"wline", /* # of lines in current window */
"cwline", /* current screen line in window */
"target", /* target for line moves */
"search", /* search pattern */
"replace", /* replacement pattern */
"match", /* last matched magic pattern */
"kill", /* kill buffer (read only) */
"cmode", /* mode of current buffer */
"gmode", /* global modes */
"tpause", /* length to pause for paren matching */
"pending", /* type ahead pending flag */
"lwidth", /* width of current line */
"line", /* text of current line */
"gflags", /* global internal emacs flags */
"rval", /* child process return value */
"tab", /* tab 4 or 8 */
"overlap",
"jump",
#if SCROLLCODE
"scroll", /* scroll enabled */
#endif
};
/* And its preprocesor definitions. */
#define EVFILLCOL 0
#define EVPAGELEN 1
#define EVCURCOL 2
#define EVCURLINE 3
#define EVRAM 4
#define EVFLICKER 5
#define EVCURWIDTH 6
#define EVCBUFNAME 7
#define EVCFNAME 8
#define EVSRES 9
#define EVDEBUG 10
#define EVSTATUS 11
#define EVPALETTE 12
#define EVASAVE 13
#define EVACOUNT 14
#define EVLASTKEY 15
#define EVCURCHAR 16
#define EVDISCMD 17
#define EVVERSION 18
#define EVPROGNAME 19
#define EVSEED 20
#define EVDISINP 21
#define EVWLINE 22
#define EVCWLINE 23
#define EVTARGET 24
#define EVSEARCH 25
#define EVREPLACE 26
#define EVMATCH 27
#define EVKILL 28
#define EVCMODE 29
#define EVGMODE 30
#define EVTPAUSE 31
#define EVPENDING 32
#define EVLWIDTH 33
#define EVLINE 34
#define EVGFLAGS 35
#define EVRVAL 36
#define EVTAB 37
#define EVOVERLAP 38
#define EVSCROLLCOUNT 39
#define EVSCROLL 40
enum function_type {
NILNAMIC = 0,
MONAMIC,
DYNAMIC,
TRINAMIC,
};
/* List of recognized user functions. */
static struct {
const char f_name[ 4] ;
const enum function_type f_type ;
} funcs[] = {
{ "add", DYNAMIC }, /* add two numbers together */
{ "sub", DYNAMIC }, /* subtraction */
{ "tim", DYNAMIC }, /* multiplication */
{ "div", DYNAMIC }, /* division */
{ "mod", DYNAMIC }, /* mod */
{ "neg", MONAMIC }, /* negate */
{ "cat", DYNAMIC }, /* concatinate string */
{ "lef", DYNAMIC }, /* left string(string, len) */
{ "rig", DYNAMIC }, /* right string(string, pos) */
{ "mid", TRINAMIC }, /* mid string(string, pos, len) */
{ "not", MONAMIC }, /* logical not */
{ "equ", DYNAMIC }, /* logical equality check */
{ "les", DYNAMIC }, /* logical less than */
{ "gre", DYNAMIC }, /* logical greater than */
{ "seq", DYNAMIC }, /* string logical equality check */
{ "sle", DYNAMIC }, /* string logical less than */
{ "sgr", DYNAMIC }, /* string logical greater than */
{ "ind", MONAMIC }, /* evaluate indirect value */
{ "and", DYNAMIC }, /* logical and */
{ "or", DYNAMIC }, /* logical or */
{ "len", MONAMIC }, /* string length */
{ "upp", MONAMIC }, /* uppercase string */
{ "low", MONAMIC }, /* lower case string */
{ "tru", MONAMIC }, /* Truth of the universe logical test */
{ "asc", MONAMIC }, /* char to integer conversion */
{ "chr", MONAMIC }, /* integer to char conversion */
{ "gtk", NILNAMIC }, /* get 1 charater */
{ "rnd", MONAMIC }, /* get a random number */
{ "abs", MONAMIC }, /* absolute value of a number */
{ "sin", DYNAMIC }, /* find the index of one string in another */
{ "env", MONAMIC }, /* retrieve a system environment var */
{ "bin", MONAMIC }, /* loopup what function name is bound to a key */
{ "exi", MONAMIC }, /* check if a file exists */
{ "fin", MONAMIC }, /* look for a file on the path... */
{ "ban", DYNAMIC }, /* bitwise and 9-10-87 jwm */
{ "bor", DYNAMIC }, /* bitwise or 9-10-87 jwm */
{ "bxo", DYNAMIC }, /* bitwise xor 9-10-87 jwm */
{ "bno", MONAMIC }, /* bitwise not */
{ "xla", TRINAMIC }, /* XLATE character string translation */
};
/* And its preprocesor definitions. */
#define UFADD 0
#define UFSUB 1
#define UFTIMES 2
#define UFDIV 3
#define UFMOD 4
#define UFNEG 5
#define UFCAT 6
#define UFLEFT 7
#define UFRIGHT 8
#define UFMID 9
#define UFNOT 10
#define UFEQUAL 11
#define UFLESS 12
#define UFGREATER 13
#define UFSEQUAL 14
#define UFSLESS 15
#define UFSGREAT 16
#define UFIND 17
#define UFAND 18
#define UFOR 19
#define UFLENGTH 20
#define UFUPPER 21
#define UFLOWER 22
#define UFTRUTH 23
#define UFASCII 24
#define UFCHR 25
#define UFGTKEY 26
#define UFRND 27
#define UFABS 28
#define UFSINDEX 29
#define UFENV 30
#define UFBIND 31
#define UFEXIST 32
#define UFFIND 33
#define UFBAND 34
#define UFBOR 35
#define UFBXOR 36
#define UFBNOT 37
#define UFXLATE 38
/* User variables */
static struct user_variable uv[MAXVARS + 1];
/* When emacs' command interpetor needs to get a variable's name,
* rather than it's value, it is passed back as a variable description
* structure. The v_num field is a index into the appropriate variable table.
*/
struct variable_description {
int v_type; /* Type of variable. */
int v_num; /* Ordinal pointer to variable in list. */
};
static void findvar( char *var, struct variable_description *vd, int size) ;
static int svar( struct variable_description *var, char *value) ;
/*
* putctext:
* replace the current line with the passed in text
*
* char *iline; contents of new line
*/
static int putctext( char *iline)
{
int status;
/* delete the current line */
curwp->w_doto = 0; /* starting at the beginning of the line */
if ((status = killtext(TRUE, 1)) != TRUE)
return status;
/* insert the new line */
if ((status = linstr(iline)) != TRUE)
return status;
status = lnewline();
backline(TRUE, 1);
return status;
}
/* Initialize the user variable list. */
void varinit(void)
{
int i;
for (i = 0; i < MAXVARS; i++)
uv[i].u_name[0] = 0;
}
/*
* Evaluate a function.
*
* @fname: name of function to evaluate.
*/
char *gtfun(char *fname)
{
int fnum; /* index to function to eval */
int status; /* return status */
char *tsp; /* temporary string pointer */
char arg1[NSTRING]; /* value of first argument */
char arg2[NSTRING]; /* value of second argument */
char arg3[NSTRING]; /* value of third argument */
static char result[2 * NSTRING]; /* string result */
/* look the function up in the function table */
fname[3] = 0; /* only first 3 chars significant */
mklower(fname); /* and let it be upper or lower case */
for (fnum = 0; fnum < ARRAY_SIZE(funcs); fnum++)
if (strcmp(fname, funcs[fnum].f_name) == 0)
break;
/* return errorm on a bad reference */
if (fnum == ARRAY_SIZE(funcs))
return errorm;
/* if needed, retrieve the first argument */
if (funcs[fnum].f_type >= MONAMIC) {
if ((status = macarg(arg1)) != TRUE)
return errorm;
/* if needed, retrieve the second argument */
if (funcs[fnum].f_type >= DYNAMIC) {
if ((status = macarg(arg2)) != TRUE)
return errorm;
/* if needed, retrieve the third argument */
if (funcs[fnum].f_type >= TRINAMIC)
if ((status = macarg(arg3)) != TRUE)
return errorm;
}
}
/* and now evaluate it! */
switch (fnum) {
case UFADD:
return itoa(atoi(arg1) + atoi(arg2));
case UFSUB:
return itoa(atoi(arg1) - atoi(arg2));
case UFTIMES:
return itoa(atoi(arg1) * atoi(arg2));
case UFDIV:
return itoa(atoi(arg1) / atoi(arg2));
case UFMOD:
return itoa(atoi(arg1) % atoi(arg2));
case UFNEG:
return itoa(-atoi(arg1));
case UFCAT:
strcpy(result, arg1);
return strcat(result, arg2);
case UFLEFT:
return strncpy(result, arg1, atoi(arg2));
case UFRIGHT:
return (strcpy(result,
&arg1[(strlen(arg1) - atoi(arg2))]));
case UFMID:
return (strncpy(result, &arg1[atoi(arg2) - 1],
atoi(arg3)));
case UFNOT:
return ltos(stol(arg1) == FALSE);
case UFEQUAL:
return ltos(atoi(arg1) == atoi(arg2));
case UFLESS:
return ltos(atoi(arg1) < atoi(arg2));
case UFGREATER:
return ltos(atoi(arg1) > atoi(arg2));
case UFSEQUAL:
return ltos(strcmp(arg1, arg2) == 0);
case UFSLESS:
return ltos(strcmp(arg1, arg2) < 0);
case UFSGREAT:
return ltos(strcmp(arg1, arg2) > 0);
case UFIND:
return strcpy(result, getval(arg1));
case UFAND:
return ltos(stol(arg1) && stol(arg2));
case UFOR:
return ltos(stol(arg1) || stol(arg2));
case UFLENGTH:
return itoa(strlen(arg1));
case UFUPPER:
return mkupper(arg1);
case UFLOWER:
return mklower(arg1);
case UFTRUTH:
return ltos(atoi(arg1) == 42);
case UFASCII:
return itoa((int) arg1[0]);
case UFCHR:
result[0] = atoi(arg1);
result[1] = 0;
return result;
case UFGTKEY:
result[0] = tgetc();
result[1] = 0;
return result;
case UFRND:
return itoa((ernd() % abs(atoi(arg1))) + 1);
case UFABS:
return itoa(abs(atoi(arg1)));
case UFSINDEX:
return itoa(sindex(arg1, arg2));
case UFENV:
#if ENVFUNC
tsp = getenv(arg1);
return tsp == NULL ? "" : tsp;
#else
return "";
#endif
case UFBIND:
return transbind(arg1);
case UFEXIST:
return ltos(fexist(arg1));
case UFFIND:
tsp = flook(arg1, TRUE);
return tsp == NULL ? "" : tsp;
case UFBAND:
return itoa(atoi(arg1) & atoi(arg2));
case UFBOR:
return itoa(atoi(arg1) | atoi(arg2));
case UFBXOR:
return itoa(atoi(arg1) ^ atoi(arg2));
case UFBNOT:
return itoa(~atoi(arg1));
case UFXLATE:
return xlat(arg1, arg2, arg3);
}
exit(-11); /* never should get here */
}
/*
* look up a user var's value
*
* char *vname; name of user variable to fetch
*/
char *gtusr(char *vname)
{
int vnum; /* ordinal number of user var */
/* scan the list looking for the user var name */
for (vnum = 0; vnum < MAXVARS; vnum++) {
if (uv[vnum].u_name[0] == 0)
return errorm;
if (strcmp(vname, uv[vnum].u_name) == 0)
return uv[vnum].u_value;
}
/* return errorm if we run off the end */
return errorm;
}
/*
* gtenv()
*
* char *vname; name of environment variable to retrieve
*/
char *gtenv(char *vname)
{
int vnum; /* ordinal number of var refrenced */
/* scan the list, looking for the referenced name */
for (vnum = 0; vnum < ARRAY_SIZE(envars); vnum++)
if (strcmp(vname, envars[vnum]) == 0)
break;
/* return errorm on a bad reference */
if (vnum == ARRAY_SIZE(envars))
#if ENVFUNC
{
char *ename = getenv(vname);
if (ename != NULL)
return ename;
else
return errorm;
}
#else
return errorm;
#endif
/* otherwise, fetch the appropriate value */
switch (vnum) {
case EVFILLCOL:
return itoa(fillcol);
case EVPAGELEN:
return itoa(term.t_nrow + 1);
case EVCURCOL:
return itoa(getccol(FALSE));
case EVCURLINE:
return itoa(getcline());
case EVRAM:
return itoa((int) (envram / 1024l));
case EVFLICKER:
return ltos(flickcode);
case EVCURWIDTH:
return itoa(term.t_ncol);
case EVCBUFNAME:
return curbp->b_bname;
case EVCFNAME:
return curbp->b_fname;
case EVSRES:
return sres;
case EVDEBUG:
return ltos(macbug);
case EVSTATUS:
return ltos(cmdstatus);
case EVPALETTE: {
static char palstr[ 49] = "" ; /* palette string */
return palstr;
}
case EVASAVE:
return itoa(gasave);
case EVACOUNT:
return itoa(gacount);
case EVLASTKEY:
return itoa(lastkey);
case EVCURCHAR:
return (curwp->w_dotp->l_used ==
curwp->w_doto ? itoa('\n') :
itoa(lgetc(curwp->w_dotp, curwp->w_doto)));
case EVDISCMD:
return ltos(discmd);
case EVVERSION:
return VERSION;
case EVPROGNAME:
return PROGRAM_NAME_LONG;
case EVSEED:
return itoa(seed);
case EVDISINP:
return ltos(disinp);
case EVWLINE:
return itoa(curwp->w_ntrows);
case EVCWLINE:
return itoa(getwpos());
case EVTARGET:
saveflag = lastflag;
return itoa(curgoal);
case EVSEARCH:
return pat;
case EVREPLACE:
return rpat;
case EVMATCH:
return (patmatch == NULL) ? "" : patmatch;
case EVKILL:
return getkill();
case EVCMODE:
return itoa(curbp->b_mode);
case EVGMODE:
return itoa(gmode);
case EVTPAUSE:
return itoa(term.t_pause);
case EVPENDING:
#if TYPEAH
return ltos(typahead());
#else
return falsem;
#endif
case EVLWIDTH:
return itoa(llength(curwp->w_dotp));
case EVLINE:
return getctext();
case EVGFLAGS:
return itoa(gflags);
case EVRVAL:
return itoa(rval);
case EVTAB:
return itoa(tabmask + 1);
case EVOVERLAP:
return itoa(overlap);
case EVSCROLLCOUNT:
return itoa(scrollcount);
#if SCROLLCODE
case EVSCROLL:
return ltos(term.t_scroll != NULL);
#else
case EVSCROLL:
return ltos(0);
#endif
}
exit(-12); /* again, we should never get here */
}
/*
* set a variable
*
* int f; default flag
* int n; numeric arg (can overide prompted value)
*/
int setvar(int f, int n)
{
int status; /* status return */
struct variable_description vd; /* variable num/type */
char var[NVSIZE + 1]; /* name of variable to fetch */
char value[NSTRING]; /* value to set variable to */
/* first get the variable to set.. */
if (clexec == FALSE) {
status = mlreply("Variable to set: ", &var[0], NVSIZE);
if (status != TRUE)
return status;
} else { /* macro line argument */
/* grab token and skip it */
execstr = token(execstr, var, NVSIZE + 1);
}
/* check the legality and find the var */
findvar(var, &vd, NVSIZE + 1);
/* if its not legal....bitch */
if (vd.v_type == -1) {
mlwrite("%%No such variable as '%s'", var);
return FALSE;
}
/* get the value for that variable */
if (f == TRUE)
strcpy(value, itoa(n));
else {
status = mlreply("Value: ", &value[0], NSTRING);
if (status != TRUE)
return status;
}
/* and set the appropriate value */
status = svar(&vd, value);
#if DEBUGM
/* if $debug == TRUE, every assignment will echo a statment to
that effect here. */
if (macbug) {
char *sp ; /* temp string pointer */
strcpy(outline, "(((");
/* assignment status */
strcat(outline, ltos(status));
strcat(outline, ":");
/* variable name */
strcat(outline, var);
strcat(outline, ":");
/* and lastly the value we tried to assign */
strcat(outline, value);
strcat(outline, ")))");
/* expand '%' to "%%" so mlwrite wont bitch */
sp = outline;
while (*sp)
if (*sp++ == '%') {
char *ep ; /* ptr to end of outline */
/* advance to the end */
ep = --sp;
while (*ep++);
/* null terminate the string one out */
*(ep + 1) = 0;
/* copy backwards */
while (ep-- > sp)
*(ep + 1) = *ep;
/* and advance sp past the new % */
sp += 2;
}
/* write out the debug line */
mlforce(outline);
update(TRUE);
/* and get the keystroke to hold the output */
if (get1key() == abortc) {
mlforce("(Macro aborted)");
status = FALSE;
}
}
#endif
/* and return it */
return status;
}
/*
* Find a variables type and name.
*
* @var: name of variable to get.
* @vd: structure to hold type and pointer.
* @size: size of variable array.
*/
static void findvar(char *var, struct variable_description *vd, int size)
{
int vnum; /* subscript in variable arrays */
int vtype; /* type to return */
vnum = -1;
fvar:
vtype = -1;
switch (var[0]) {
case '$': /* check for legal enviromnent var */
for (vnum = 0; vnum < ARRAY_SIZE(envars); vnum++)
if (strcmp(&var[1], envars[vnum]) == 0) {
vtype = TKENV;
break;
}
break;
case '%': /* check for existing legal user variable */
for (vnum = 0; vnum < MAXVARS; vnum++)
if (strcmp(&var[1], uv[vnum].u_name) == 0) {
vtype = TKVAR;
break;
}
if (vnum < MAXVARS)
break;
/* create a new one??? */
for (vnum = 0; vnum < MAXVARS; vnum++)
if (uv[vnum].u_name[0] == 0) {
vtype = TKVAR;
strcpy(uv[vnum].u_name, &var[1]);
break;
}
break;
case '&': /* indirect operator? */
var[4] = 0;
if (strcmp(&var[1], "ind") == 0) {
/* grab token, and eval it */
execstr = token(execstr, var, size);
strcpy(var, getval(var));
goto fvar;
}
}
/* return the results */
vd->v_num = vnum;
vd->v_type = vtype;
return;
}
/*
* Set a variable.
*
* @var: variable to set.
* @value: value to set to.
*/
static int svar(struct variable_description *var, char *value)
{
int vnum; /* ordinal number of var refrenced */
int vtype; /* type of variable to set */
int status; /* status return */
int c; /* translated character */
char *sp; /* scratch string pointer */
/* simplify the vd structure (we are gonna look at it a lot) */
vnum = var->v_num;
vtype = var->v_type;
/* and set the appropriate value */
status = TRUE;
switch (vtype) {
case TKVAR: /* set a user variable */
if (uv[vnum].u_value != NULL)
free(uv[vnum].u_value);
sp = malloc(strlen(value) + 1);
if (sp == NULL)
return FALSE;
strcpy(sp, value);
uv[vnum].u_value = sp;
break;
case TKENV: /* set an environment variable */
status = TRUE; /* by default */
switch (vnum) {
case EVFILLCOL:
fillcol = atoi(value);
break;
case EVPAGELEN:
status = newsize(TRUE, atoi(value));
break;
case EVCURCOL:
status = setccol(atoi(value));
break;
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:
ldelchar(1, 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
*/
static char *ltos( int val)
{
static char truem[] = "TRUE" ; /* true literal */
static char falsem[] = "FALSE" ; /* false literal */
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;
}
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