inpgtok.c

另一款电路设计软件

/**********
Copyright 1990 Regents of the University of California.  All rights reserved.
Author: 1985 Thomas L. Quarles
**********/

    /* get input token from 'line', 
     *  and return a pointer to it in 'token'
     */

#include "spice.h"
#include "misc.h"
#include <stdio.h>
#include "util.h"
#include "iferrmsg.h"
#include "inpdefs.h"
#include "suffix.h"

int
INPgetTok(line,token,gobble)
    char ** line;
    char ** token;
	int gobble; /* eat non-whitespace trash AFTER token? */
{
    char * point;
    int signstate;
    /* scan along throwing away garbage characters */
    for(point = *line;*point != '\0' ; point++ ) {
        if(*point == ' ') continue;
        if(*point == '\t') continue;
        if(*point == '=') continue;
        if(*point == '(') continue;
        if(*point == ')') continue;
        if(*point == ',') continue;
        break;
    }
    /* mark beginning of token */
    *line = point;
    /* now find all good characters */
    signstate = 0;
    for(point = *line;*point!='\0';point++) {
        if(*point == ' ') break;
        if(*point == '\t') break;
        if(*point == '=') break;
        if(*point == '(') break;
        if(*point == ')') break;
        if(*point == ',') break;
	/* This is not complex enough to catch all errors, but it will
	   get the "good" parses */
        if(*point == '+' && (signstate == 1 || signstate == 3)) break;
        if(*point == '-') {
	    if (signstate == 1 || signstate == 3) break;
	    signstate += 1;
	    continue;
	}
        if(*point == '*') break;
        if(*point == '/') break;
        if(*point == '^') break;
	if (isdigit(*point) || *point == '.') {
	    if (signstate > 1)
		signstate = 3;
	    else
		signstate = 1;
	} else if (tolower(*point) == 'e' && signstate == 1)
	    signstate = 2;
	else
	    signstate = 3;
    }
    if (point == *line && *point)	/* Weird items, 1 char */
	point++;
    *token=(char *)MALLOC(1+point-*line);
    if(!*token) return(E_NOMEM);
    (void) strncpy(*token,*line,point-*line);
    *(*token + (point-*line)) = '\0';
    *line = point;
    /* gobble garbage to next token */
    for( ;**line != '\0' ; (*line)++ ) {
        if(**line == ' ') continue;
        if(**line == '\t') continue;
        if((**line == '=') && gobble) continue;
        if((**line == ',') && gobble) continue;
#ifdef notdef
        if((**line == /* (match */')') && gobble) continue;
    /* This is the wrong thing to do for expression-valued parameters. */
        if((**line == '(' /* match) */) && gobble) continue;
#endif
        break;
    }
    /*printf("found token (%s) and rest of line (%s)\n",*token,*line);*/
    return(OK);
}