443 lines
9.8 KiB
C
443 lines
9.8 KiB
C
/* $RCSfile: str.c,v $$Revision: 4.1 $$Date: 92/08/07 18:29:26 $
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*
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* Copyright (c) 1991-1997, Larry Wall
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*
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* You may distribute under the terms of either the GNU General Public
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* License or the Artistic License, as specified in the README file.
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*
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* $Log: str.c,v $
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*/
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#include "EXTERN.h"
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#include "a2p.h"
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#include "util.h"
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void
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str_numset(register STR *str, double num)
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{
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str->str_nval = num;
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str->str_pok = 0; /* invalidate pointer */
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str->str_nok = 1; /* validate number */
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}
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char *
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str_2ptr(register STR *str)
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{
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register char *s;
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if (!str)
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return "";
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GROWSTR(&(str->str_ptr), &(str->str_len), 24);
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s = str->str_ptr;
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if (str->str_nok) {
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sprintf(s,"%.20g",str->str_nval);
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while (*s) s++;
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}
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*s = '\0';
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str->str_cur = s - str->str_ptr;
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str->str_pok = 1;
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#ifdef DEBUGGING
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if (debug & 32)
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fprintf(stderr,"0x%lx ptr(%s)\n",(unsigned long)str,str->str_ptr);
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#endif
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return str->str_ptr;
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}
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double
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str_2num(register STR *str)
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{
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if (!str)
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return 0.0;
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if (str->str_len && str->str_pok)
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str->str_nval = atof(str->str_ptr);
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else
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str->str_nval = 0.0;
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str->str_nok = 1;
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#ifdef DEBUGGING
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if (debug & 32)
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fprintf(stderr,"0x%lx num(%g)\n",(unsigned long)str,str->str_nval);
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#endif
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return str->str_nval;
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}
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void
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str_sset(STR *dstr, register STR *sstr)
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{
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if (!sstr)
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str_nset(dstr,No,0);
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else if (sstr->str_nok)
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str_numset(dstr,sstr->str_nval);
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else if (sstr->str_pok)
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str_nset(dstr,sstr->str_ptr,sstr->str_cur);
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else
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str_nset(dstr,"",0);
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}
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void
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str_nset(register STR *str, register char *ptr, register int len)
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{
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GROWSTR(&(str->str_ptr), &(str->str_len), len + 1);
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bcopy(ptr,str->str_ptr,len);
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str->str_cur = len;
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*(str->str_ptr+str->str_cur) = '\0';
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str->str_nok = 0; /* invalidate number */
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str->str_pok = 1; /* validate pointer */
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}
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void
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str_set(register STR *str, register char *ptr)
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{
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register int len;
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if (!ptr)
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ptr = "";
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len = strlen(ptr);
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GROWSTR(&(str->str_ptr), &(str->str_len), len + 1);
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bcopy(ptr,str->str_ptr,len+1);
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str->str_cur = len;
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str->str_nok = 0; /* invalidate number */
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str->str_pok = 1; /* validate pointer */
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}
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void
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str_chop(register STR *str, register char *ptr) /* like set but assuming ptr is in str */
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{
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if (!(str->str_pok))
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str_2ptr(str);
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str->str_cur -= (ptr - str->str_ptr);
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bcopy(ptr,str->str_ptr, str->str_cur + 1);
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str->str_nok = 0; /* invalidate number */
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str->str_pok = 1; /* validate pointer */
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}
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void
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str_ncat(register STR *str, register char *ptr, register int len)
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{
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if (!(str->str_pok))
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str_2ptr(str);
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GROWSTR(&(str->str_ptr), &(str->str_len), str->str_cur + len + 1);
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bcopy(ptr,str->str_ptr+str->str_cur,len);
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str->str_cur += len;
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*(str->str_ptr+str->str_cur) = '\0';
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str->str_nok = 0; /* invalidate number */
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str->str_pok = 1; /* validate pointer */
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}
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void
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str_scat(STR *dstr, register STR *sstr)
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{
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if (!(sstr->str_pok))
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str_2ptr(sstr);
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if (sstr)
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str_ncat(dstr,sstr->str_ptr,sstr->str_cur);
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}
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void
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str_cat(register STR *str, register char *ptr)
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{
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register int len;
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if (!ptr)
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return;
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if (!(str->str_pok))
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str_2ptr(str);
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len = strlen(ptr);
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GROWSTR(&(str->str_ptr), &(str->str_len), str->str_cur + len + 1);
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bcopy(ptr,str->str_ptr+str->str_cur,len+1);
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str->str_cur += len;
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str->str_nok = 0; /* invalidate number */
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str->str_pok = 1; /* validate pointer */
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}
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char *
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str_append_till(register STR *str, register char *from, register int delim, char *keeplist)
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{
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register char *to;
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register int len;
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if (!from)
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return Nullch;
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len = strlen(from);
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GROWSTR(&(str->str_ptr), &(str->str_len), str->str_cur + len + 1);
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str->str_nok = 0; /* invalidate number */
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str->str_pok = 1; /* validate pointer */
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to = str->str_ptr+str->str_cur;
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for (; *from; from++,to++) {
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if (*from == '\\' && from[1] && delim != '\\') {
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if (!keeplist) {
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if (from[1] == delim || from[1] == '\\')
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from++;
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else
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*to++ = *from++;
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}
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else if (strchr(keeplist,from[1]))
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*to++ = *from++;
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else
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from++;
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}
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else if (*from == delim)
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break;
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*to = *from;
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}
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*to = '\0';
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str->str_cur = to - str->str_ptr;
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return from;
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}
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STR *
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str_new(int len)
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{
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register STR *str;
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if (freestrroot) {
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str = freestrroot;
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freestrroot = str->str_link.str_next;
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}
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else {
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str = (STR *) safemalloc(sizeof(STR));
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bzero((char*)str,sizeof(STR));
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}
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if (len)
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GROWSTR(&(str->str_ptr), &(str->str_len), len + 1);
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return str;
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}
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void
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str_grow(register STR *str, int len)
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{
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if (len && str)
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GROWSTR(&(str->str_ptr), &(str->str_len), len + 1);
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}
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/* make str point to what nstr did */
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void
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str_replace(register STR *str, register STR *nstr)
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{
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safefree(str->str_ptr);
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str->str_ptr = nstr->str_ptr;
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str->str_len = nstr->str_len;
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str->str_cur = nstr->str_cur;
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str->str_pok = nstr->str_pok;
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if (str->str_nok = nstr->str_nok)
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str->str_nval = nstr->str_nval;
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safefree((char*)nstr);
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}
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void
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str_free(register STR *str)
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{
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if (!str)
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return;
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if (str->str_len)
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str->str_ptr[0] = '\0';
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str->str_cur = 0;
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str->str_nok = 0;
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str->str_pok = 0;
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str->str_link.str_next = freestrroot;
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freestrroot = str;
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}
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int
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str_len(register STR *str)
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{
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if (!str)
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return 0;
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if (!(str->str_pok))
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str_2ptr(str);
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if (str->str_len)
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return str->str_cur;
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else
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return 0;
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}
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char *
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str_gets(register STR *str, register FILE *fp)
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{
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#if defined(USE_STDIO_PTR) && defined(STDIO_PTR_LVALUE) && defined(STDIO_CNT_LVALUE)
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/* Here is some breathtakingly efficient cheating */
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register char *bp; /* we're going to steal some values */
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register int cnt; /* from the stdio struct and put EVERYTHING */
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register STDCHAR *ptr; /* in the innermost loop into registers */
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register char newline = '\n'; /* (assuming at least 6 registers) */
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int i;
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int bpx;
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#if defined(VMS)
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/* An ungetc()d char is handled separately from the regular
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* buffer, so we getc() it back out and stuff it in the buffer.
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*/
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i = getc(fp);
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if (i == EOF) return Nullch;
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*(--((*fp)->_ptr)) = (unsigned char) i;
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(*fp)->_cnt++;
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#endif
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cnt = FILE_cnt(fp); /* get count into register */
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str->str_nok = 0; /* invalidate number */
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str->str_pok = 1; /* validate pointer */
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if (str->str_len <= cnt) /* make sure we have the room */
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GROWSTR(&(str->str_ptr), &(str->str_len), cnt+1);
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bp = str->str_ptr; /* move these two too to registers */
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ptr = FILE_ptr(fp);
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for (;;) {
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while (--cnt >= 0) {
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if ((*bp++ = *ptr++) == newline)
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if (bp <= str->str_ptr || bp[-2] != '\\')
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goto thats_all_folks;
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else {
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line++;
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bp -= 2;
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}
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}
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FILE_cnt(fp) = cnt; /* deregisterize cnt and ptr */
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FILE_ptr(fp) = ptr;
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i = getc(fp); /* get more characters */
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cnt = FILE_cnt(fp);
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ptr = FILE_ptr(fp); /* reregisterize cnt and ptr */
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bpx = bp - str->str_ptr; /* prepare for possible relocation */
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GROWSTR(&(str->str_ptr), &(str->str_len), str->str_cur + cnt + 1);
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bp = str->str_ptr + bpx; /* reconstitute our pointer */
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if (i == newline) { /* all done for now? */
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*bp++ = i;
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goto thats_all_folks;
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}
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else if (i == EOF) /* all done for ever? */
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goto thats_all_folks;
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*bp++ = i; /* now go back to screaming loop */
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}
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thats_all_folks:
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FILE_cnt(fp) = cnt; /* put these back or we're in trouble */
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FILE_ptr(fp) = ptr;
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*bp = '\0';
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str->str_cur = bp - str->str_ptr; /* set length */
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#else /* USE_STDIO_PTR && STDIO_PTR_LVALUE && STDIO_CNT_LVALUE */
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/* The big, slow, and stupid way */
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static char buf[4192];
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if (fgets(buf, sizeof buf, fp) != Nullch)
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str_set(str, buf);
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else
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str_set(str, No);
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#endif /* USE_STDIO_PTR && STDIO_PTR_LVALUE && STDIO_CNT_LVALUE */
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return str->str_cur ? str->str_ptr : Nullch;
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}
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void
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str_inc(register STR *str)
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{
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register char *d;
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if (!str)
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return;
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if (str->str_nok) {
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str->str_nval += 1.0;
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str->str_pok = 0;
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return;
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}
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if (!str->str_pok) {
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str->str_nval = 1.0;
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str->str_nok = 1;
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return;
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}
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for (d = str->str_ptr; *d && *d != '.'; d++) ;
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d--;
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if (!isdigit(*str->str_ptr) || !isdigit(*d) ) {
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str_numset(str,atof(str->str_ptr) + 1.0); /* punt */
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return;
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}
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while (d >= str->str_ptr) {
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if (++*d <= '9')
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return;
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*(d--) = '0';
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}
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/* oh,oh, the number grew */
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GROWSTR(&(str->str_ptr), &(str->str_len), str->str_cur + 2);
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str->str_cur++;
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for (d = str->str_ptr + str->str_cur; d > str->str_ptr; d--)
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*d = d[-1];
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*d = '1';
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}
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void
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str_dec(register STR *str)
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{
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register char *d;
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if (!str)
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return;
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if (str->str_nok) {
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str->str_nval -= 1.0;
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str->str_pok = 0;
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return;
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}
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if (!str->str_pok) {
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str->str_nval = -1.0;
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str->str_nok = 1;
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return;
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}
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for (d = str->str_ptr; *d && *d != '.'; d++) ;
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d--;
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if (!isdigit(*str->str_ptr) || !isdigit(*d) || (*d == '0' && d == str->str_ptr)) {
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str_numset(str,atof(str->str_ptr) - 1.0); /* punt */
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return;
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}
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while (d >= str->str_ptr) {
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if (--*d >= '0')
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return;
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*(d--) = '9';
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}
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}
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/* make a string that will exist for the duration of the expression eval */
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STR *
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str_mortal(STR *oldstr)
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{
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register STR *str = str_new(0);
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static long tmps_size = -1;
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str_sset(str,oldstr);
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if (++tmps_max > tmps_size) {
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tmps_size = tmps_max;
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if (!(tmps_size & 127)) {
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if (tmps_size)
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tmps_list = (STR**)saferealloc((char*)tmps_list,
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(tmps_size + 128) * sizeof(STR*) );
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else
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tmps_list = (STR**)safemalloc(128 * sizeof(char*));
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}
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}
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tmps_list[tmps_max] = str;
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return str;
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}
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STR *
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str_make(char *s)
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{
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register STR *str = str_new(0);
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str_set(str,s);
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return str;
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}
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STR *
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str_nmake(double n)
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{
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register STR *str = str_new(0);
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str_numset(str,n);
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return str;
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}
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