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Refactoring gtfun(), function evaluation core.
This commit is contained in:
parent
2758464a2e
commit
18a0fbe57f
328
eval.c
328
eval.c
@ -8,7 +8,6 @@
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*/
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#include <assert.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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@ -31,8 +30,6 @@
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#include "version.h"
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#include "window.h"
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#define MAXVARS 255
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/* Macro argument token types */
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#define TKNUL 0 /* end-of-string */
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@ -71,14 +68,16 @@ static int saveflag = 0 ; /* Flags, saved with the $target var */
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long envram = 0l ; /* # of bytes current in use by malloc */
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/* Max #chars in a var name. */
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#define NVSIZE 10
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/* User variables ******************************************/
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#define MAXVARS 255
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#define NVSIZE 10 /* Max #chars in a var name. */
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/* Structure to hold user variables and their definitions. */
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struct user_variable {
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char u_name[NVSIZE + 1]; /* name of user variable */
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char *u_value; /* value (string) */
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};
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static struct {
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char u_name[ NVSIZE + 1] ; /* name of user variable */
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char *u_value ; /* value (string) */
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} uv[ MAXVARS + 1] ;
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static char errorm[] = "ERROR" ; /* error literal */
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@ -137,7 +136,7 @@ static const char *envars[] = {
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#endif
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};
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/* And its preprocesor definitions. */
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/* And its preprocessor definitions. */
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#define EVFILLCOL 0
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#define EVPAGELEN 1
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@ -190,6 +189,9 @@ enum function_type {
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TRINAMIC = (3 << 6)
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} ;
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#define ARGCOUNT( ft) (ft >> 6)
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#define FUNID( ft) (ft & ((1 << 6) - 1))
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enum function_code {
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UFADD = 0, UFSUB, UFTIMES, UFDIV, UFMOD, UFNEG,
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UFCAT, UFLEFT, UFRIGHT, UFMID, UFNOT, UFEQUAL,
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@ -204,7 +206,7 @@ enum function_code {
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static struct {
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const char f_name[ 4] ;
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const int f_type ;
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} funcs[] = {
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} const funcs[] = {
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{ "abs", UFABS | MONAMIC }, /* absolute value of a number */
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{ "add", UFADD | DYNAMIC }, /* add two numbers together */
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{ "and", UFAND | DYNAMIC }, /* logical and */
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@ -247,20 +249,17 @@ static struct {
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} ;
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/* User variables */
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static struct user_variable uv[MAXVARS + 1];
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/* When emacs' command interpetor needs to get a variable's name,
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* rather than it's value, it is passed back as a variable description
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* structure. The v_num field is a index into the appropriate variable table.
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*/
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struct variable_description {
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int v_type; /* Type of variable. */
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int v_num; /* Ordinal pointer to variable in list. */
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};
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typedef struct {
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int v_type ; /* Type of variable. */
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int v_num ; /* Ordinal pointer to variable in list. */
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} variable_description ;
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static void findvar( char *var, struct variable_description *vd, int size) ;
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static int svar( struct variable_description *var, char *value) ;
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static void findvar( char *var, variable_description *vd, int size) ;
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static int svar( variable_description *var, char *value) ;
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static char *i_to_a( int i) ;
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/*
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@ -309,25 +308,22 @@ void varinit(void)
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seed = time( NULL) ;
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}
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/*
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* Evaluate a function.
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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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static const char *gtfun( char *fname) {
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unsigned fnum ; /* index to function to eval */
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char *arg1 ; /* value of first argument */
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char *arg2 ; /* value of second argument */
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char *arg3 ; /* last argument */
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char *argv[ 3] ;
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const char *retstr ; /* return value */
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int low, high ; /* binary search indexes */
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int i ;
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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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fnum = ARRAY_SIZE( funcs) ;
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low = 0 ;
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high = fnum - 1 ;
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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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unsigned fnum = ARRAY_SIZE( funcs) ; /* index to function to eval */
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int low = 0 ; /* binary search low bound */
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int high = fnum - 1 ; /* binary search high bound */
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do {
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int s, cur ;
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@ -342,85 +338,68 @@ static const char *gtfun( char *fname) {
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low = cur + 1 ;
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} while( low <= high) ;
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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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/* 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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arg1 = arg2 = arg3 = NULL ;
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/* fetch arguments */
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assert( clexec == TRUE) ; /* means macarg can be replaced by gettokval */
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/* if needed, retrieve the first argument */
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if (funcs[fnum].f_type >= MONAMIC) {
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arg1 = getnewtokval() ;
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if( arg1 == NULL)
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return errorm;
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int argc = ARGCOUNT( funcs[ fnum].f_type) ;
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for( int i = 0 ; i < argc ; i++) {
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argv[ i] = getnewtokval() ;
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if( argv[ i] == NULL) {
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while( i > 0)
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free( argv[ --i]) ;
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/* if needed, retrieve the second argument */
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if (funcs[fnum].f_type >= DYNAMIC) {
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arg2 = getnewtokval() ;
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if( arg2 == NULL) {
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free( arg1) ;
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return errorm;
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}
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/* if needed, retrieve the third argument */
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if (funcs[fnum].f_type >= TRINAMIC) {
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arg3 = getnewtokval() ;
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if( arg3 == NULL) {
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free( arg1) ;
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free( arg2) ;
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return errorm;
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}
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}
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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( funcs[ fnum].f_type) {
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int sz ;
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/* and now evaluate it! */
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switch( FUNID( funcs[ fnum].f_type)) {
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int sz, sz1 ;
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unicode_t c ;
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case UFADD | DYNAMIC:
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retstr = i_to_a( atoi( arg1) + atoi( arg2)) ;
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case UFADD:
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retstr = i_to_a( atoi( argv[ 0]) + atoi( argv[ 1])) ;
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break ;
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case UFSUB | DYNAMIC:
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retstr = i_to_a( atoi( arg1) - atoi( arg2)) ;
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case UFSUB:
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retstr = i_to_a( atoi( argv[ 0]) - atoi( argv[ 1])) ;
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break ;
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case UFTIMES | DYNAMIC:
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retstr = i_to_a( atoi( arg1) * atoi( arg2)) ;
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case UFTIMES:
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retstr = i_to_a( atoi( argv[ 0]) * atoi( argv[ 1])) ;
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break ;
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case UFDIV | DYNAMIC:
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sz = atoi( arg2) ;
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retstr = (sz == 0) ? errorm : i_to_a( atoi( arg1) / sz) ;
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case UFDIV:
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sz = atoi( argv[ 1]) ;
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retstr = (sz == 0) ? errorm : i_to_a( atoi( argv[ 0]) / sz) ;
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break ;
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case UFMOD | DYNAMIC:
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sz = atoi( arg2) ;
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retstr = (sz == 0) ? errorm : i_to_a( atoi( arg1) % sz) ;
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case UFMOD:
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sz = atoi( argv[ 1]) ;
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retstr = (sz == 0) ? errorm : i_to_a( atoi( argv[ 0]) % sz) ;
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break ;
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case UFNEG | MONAMIC:
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retstr = i_to_a( -atoi( arg1)) ;
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case UFNEG:
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retstr = i_to_a( -atoi( argv[ 0])) ;
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break ;
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case UFCAT | DYNAMIC: {
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int sz1 ;
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sz1 = strlen( arg1) ;
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sz = sz1 + strlen( arg2) + 1 ;
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case UFCAT:
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sz1 = strlen( argv[ 0]) ;
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sz = sz1 + strlen( argv[ 1]) + 1 ;
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if( sz > ressize) {
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free( result) ;
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result = malloc( sz) ;
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ressize = sz ;
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}
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strcpy( result, arg1) ;
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strcpy( &result[ sz1], arg2) ;
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strcpy( result, argv[ 0]) ;
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strcpy( &result[ sz1], argv[ 1]) ;
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retstr = result ;
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}
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break ;
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case UFLEFT | DYNAMIC: {
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int sz1 = strlen( arg1) ;
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case UFLEFT:
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sz1 = strlen( argv[ 0]) ;
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sz = 0 ;
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for( int i = atoi( arg2) ; i > 0 ; i -= 1) {
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for( int i = atoi( argv[ 1]) ; i > 0 ; i -= 1) {
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unicode_t c ;
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sz += utf8_to_unicode( arg1, sz, sz1, &c) ;
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sz += utf8_to_unicode( argv[ 0], sz, sz1, &c) ;
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if( sz == sz1)
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break ;
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}
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@ -431,36 +410,32 @@ static const char *gtfun( char *fname) {
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ressize = sz + 1 ;
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}
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mystrscpy( result, arg1, sz + 1) ;
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mystrscpy( result, argv[ 0], sz + 1) ;
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retstr = result ;
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}
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break ;
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case UFRIGHT | DYNAMIC:
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sz = atoi( arg2) ;
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case UFRIGHT:
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sz = atoi( argv[ 1]) ;
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if( sz >= ressize) {
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free( result) ;
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result = malloc( sz + 1) ;
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ressize = sz + 1 ;
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}
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retstr = strcpy( result, &arg1[ strlen( arg1) - sz]) ;
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retstr = strcpy( result, &(argv[ 0][ strlen( argv[ 0]) - sz])) ;
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break ;
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case UFMID | TRINAMIC: {
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int i ;
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unicode_t c ;
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int sz1 = strlen( arg1) ;
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case UFMID:
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sz1 = strlen( argv[ 0]) ;
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int start = 0 ;
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for( i = atoi( arg2) - 1 ; i > 0 ; i -= 1) {
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start += utf8_to_unicode( arg1, start, sz1, &c) ;
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for( i = atoi( argv[ 1]) - 1 ; i > 0 ; i -= 1) {
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start += utf8_to_unicode( argv[ 0], start, sz1, &c) ;
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if( start == sz1)
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break ;
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}
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sz = start ;
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if( sz < sz1)
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for( i = atoi( arg3) ; i > 0 ; i -= 1) {
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sz += utf8_to_unicode( arg1, sz, sz1, &c) ;
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for( i = atoi( argv[ 2]) ; i > 0 ; i -= 1) {
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sz += utf8_to_unicode( argv[ 0], sz, sz1, &c) ;
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if( sz == sz1)
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break ;
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}
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@ -472,33 +447,32 @@ static const char *gtfun( char *fname) {
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ressize = sz + 1 ;
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}
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mystrscpy( result, &arg1[ start], sz + 1) ;
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mystrscpy( result, &(argv[ 0][ start]), sz + 1) ;
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retstr = result ;
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}
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break ;
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case UFNOT | MONAMIC:
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retstr = ltos( stol( arg1) == FALSE) ;
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case UFNOT:
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retstr = ltos( stol( argv[ 0]) == FALSE) ;
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break ;
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case UFEQUAL | DYNAMIC:
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retstr = ltos( atoi( arg1) == atoi( arg2)) ;
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case UFEQUAL:
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retstr = ltos( atoi( argv[ 0]) == atoi( argv[ 1])) ;
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break ;
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case UFLESS | DYNAMIC:
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retstr = ltos( atoi( arg1) < atoi( arg2)) ;
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case UFLESS:
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retstr = ltos( atoi( argv[ 0]) < atoi( argv[ 1])) ;
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break ;
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case UFGREATER | DYNAMIC:
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retstr = ltos( atoi( arg1) > atoi( arg2)) ;
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case UFGREATER:
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retstr = ltos( atoi( argv[ 0]) > atoi( argv[ 1])) ;
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break ;
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case UFSEQUAL | DYNAMIC:
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retstr = ltos( strcmp( arg1, arg2) == 0) ;
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case UFSEQUAL:
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retstr = ltos( strcmp( argv[ 0], argv[ 1]) == 0) ;
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break ;
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case UFSLESS | DYNAMIC:
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retstr = ltos( strcmp( arg1, arg2) < 0) ;
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case UFSLESS:
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retstr = ltos( strcmp( argv[ 0], argv[ 1]) < 0) ;
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break ;
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case UFSGREAT | DYNAMIC:
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retstr = ltos( strcmp( arg1, arg2) > 0) ;
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case UFSGREAT:
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retstr = ltos( strcmp( argv[ 0], argv[ 1]) > 0) ;
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break ;
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case UFIND | MONAMIC:
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retstr = getval( arg1) ;
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case UFIND:
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retstr = getval( argv[ 0]) ;
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sz = strlen( retstr) + 1 ;
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if( sz > ressize) {
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free( result) ;
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@ -508,51 +482,45 @@ static const char *gtfun( char *fname) {
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retstr = strcpy( result, retstr) ;
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break ;
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case UFAND | DYNAMIC:
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retstr = ltos( stol( arg1) && stol( arg2)) ;
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case UFAND:
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retstr = ltos( stol( argv[ 0]) && stol( argv[ 1])) ;
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break ;
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case UFOR | DYNAMIC:
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retstr = ltos( stol( arg1) || stol( arg2)) ;
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case UFOR:
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retstr = ltos( stol( argv[ 0]) || stol( argv[ 1])) ;
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break ;
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case UFLENGTH | MONAMIC:
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retstr = i_to_a( strlen( arg1)) ;
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case UFLENGTH:
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retstr = i_to_a( strlen( argv[ 0])) ;
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break ;
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case UFUPPER | MONAMIC:
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sz = strlen( arg1) ;
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case UFUPPER:
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sz = strlen( argv[ 0]) ;
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if( sz >= ressize) {
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free( result) ;
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result = malloc( sz + 1) ;
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ressize = sz + 1 ;
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}
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retstr = mkupper( result, arg1) ;
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retstr = mkupper( result, argv[ 0]) ;
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break ;
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case UFLOWER | MONAMIC:
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sz = strlen( arg1) ;
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case UFLOWER:
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sz = strlen( argv[ 0]) ;
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if( sz >= ressize) {
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free( result) ;
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result = malloc( sz + 1) ;
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ressize = sz + 1 ;
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}
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strcpy( result, arg1) ; /* result is at least as long as arg1 */
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strcpy( result, argv[ 0]) ; /* result is at least as long as argv[ 0] */
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retstr = mklower( result) ;
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break ;
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case UFTRUTH | MONAMIC:
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retstr = ltos( atoi( arg1) == 42) ;
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case UFTRUTH:
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retstr = ltos( atoi( argv[ 0]) == 42) ;
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break ;
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case UFASCII | MONAMIC: {
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unicode_t c ;
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utf8_to_unicode( arg1, 0, 4, &c) ;
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case UFASCII:
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utf8_to_unicode( argv[ 0], 0, 4, &c) ;
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retstr = i_to_a( c) ;
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}
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break ;
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case UFCHR | MONAMIC: {
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unicode_t c ;
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c = atoi( arg1) ;
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case UFCHR:
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c = atoi( argv[ 0]) ;
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if( c > 0x10FFFF)
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retstr = errorm ;
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else {
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@ -560,71 +528,63 @@ static const char *gtfun( char *fname) {
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result[ sz] = 0 ;
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retstr = result ;
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}
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}
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break ;
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case UFGTKEY | NILNAMIC:
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case UFGTKEY:
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result[0] = tgetc();
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result[1] = 0;
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retstr = result ;
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break ;
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case UFRND | MONAMIC:
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retstr = i_to_a( ernd( atoi( arg1))) ;
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case UFRND:
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retstr = i_to_a( ernd( atoi( argv[ 0]))) ;
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break ;
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case UFABS | MONAMIC:
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retstr = i_to_a( abs( atoi( arg1))) ;
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case UFABS:
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retstr = i_to_a( abs( atoi( argv[ 0]))) ;
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break ;
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case UFSINDEX | DYNAMIC:
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retstr = i_to_a( sindex( arg1, arg2)) ;
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case UFSINDEX:
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retstr = i_to_a( sindex( argv[ 0], argv[ 1])) ;
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break ;
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case UFENV | MONAMIC:
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case UFENV:
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#if ENVFUNC
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retstr = getenv( arg1) ;
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retstr = getenv( argv[ 0]) ;
|
||||
if( retstr == NULL)
|
||||
retstr = "" ;
|
||||
#else
|
||||
retstr = "" ;
|
||||
#endif
|
||||
retstr = "" ;
|
||||
|
||||
break ;
|
||||
case UFBIND | MONAMIC:
|
||||
retstr = transbind( arg1) ;
|
||||
case UFBIND:
|
||||
retstr = transbind( argv[ 0]) ;
|
||||
break ;
|
||||
case UFEXIST | MONAMIC:
|
||||
retstr = ltos( fexist( arg1)) ;
|
||||
case UFEXIST:
|
||||
retstr = ltos( fexist( argv[ 0])) ;
|
||||
break ;
|
||||
case UFFIND | MONAMIC:
|
||||
retstr = flook( arg1, TRUE) ;
|
||||
case UFFIND:
|
||||
retstr = flook( argv[ 0], TRUE) ;
|
||||
if( retstr == NULL)
|
||||
retstr = "" ;
|
||||
break ;
|
||||
case UFBAND | DYNAMIC:
|
||||
retstr = i_to_a( atoi( arg1) & atoi( arg2)) ;
|
||||
case UFBAND:
|
||||
retstr = i_to_a( atoi( argv[ 0]) & atoi( argv[ 1])) ;
|
||||
break ;
|
||||
case UFBOR | DYNAMIC:
|
||||
retstr = i_to_a( atoi( arg1) | atoi( arg2)) ;
|
||||
case UFBOR:
|
||||
retstr = i_to_a( atoi( argv[ 0]) | atoi( argv[ 1])) ;
|
||||
break ;
|
||||
case UFBXOR | DYNAMIC:
|
||||
retstr = i_to_a( atoi( arg1) ^ atoi( arg2)) ;
|
||||
case UFBXOR:
|
||||
retstr = i_to_a( atoi( argv[ 0]) ^ atoi( argv[ 1])) ;
|
||||
break ;
|
||||
case UFBNOT | MONAMIC:
|
||||
retstr = i_to_a( ~atoi( arg1)) ;
|
||||
case UFBNOT:
|
||||
retstr = i_to_a( ~atoi( argv[ 0])) ;
|
||||
break ;
|
||||
case UFXLATE | TRINAMIC:
|
||||
retstr = xlat( arg1, arg2, arg3) ;
|
||||
case UFXLATE:
|
||||
retstr = xlat( argv[ 0], argv[ 1], argv[ 2]) ;
|
||||
break ;
|
||||
default:
|
||||
assert( FALSE) ; /* never should get here */
|
||||
retstr = errorm ;
|
||||
}
|
||||
|
||||
if( arg3)
|
||||
free( arg3) ;
|
||||
|
||||
if( arg2)
|
||||
free( arg2) ;
|
||||
|
||||
if( arg1)
|
||||
free( arg1) ;
|
||||
while( argc > 0)
|
||||
free( argv[ --argc]) ;
|
||||
|
||||
return retstr ;
|
||||
}
|
||||
@ -795,7 +755,7 @@ static char *gtenv( char *vname) {
|
||||
*/
|
||||
BINDABLE( setvar) {
|
||||
int status; /* status return */
|
||||
struct variable_description vd; /* variable num/type */
|
||||
variable_description vd ; /* variable num/type */
|
||||
char var[NVSIZE + 2]; /* name of variable to fetch %1234567890\0 */
|
||||
char *value ; /* value to set variable to */
|
||||
|
||||
@ -883,7 +843,7 @@ int mdbugout( char *fmt, ...) {
|
||||
* @vd: structure to hold type and pointer.
|
||||
* @size: size of variable array.
|
||||
*/
|
||||
static void findvar(char *var, struct variable_description *vd, int size)
|
||||
static void findvar(char *var, variable_description *vd, int size)
|
||||
{
|
||||
unsigned vnum = 0 ; /* subscript in variable arrays */
|
||||
int vtype; /* type to return */
|
||||
@ -939,7 +899,7 @@ fvar:
|
||||
* @var: variable to set.
|
||||
* @value: value to set to.
|
||||
*/
|
||||
static int svar(struct variable_description *var, char *value)
|
||||
static int svar( variable_description *var, char *value)
|
||||
{
|
||||
int vnum; /* ordinal number of var refrenced */
|
||||
int vtype; /* type of variable to set */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user