freebsd-dev/contrib/perl5/x2p/str.c
2002-03-16 20:14:30 +00:00

443 lines
9.8 KiB
C

/* $RCSfile: str.c,v $$Revision: 4.1 $$Date: 92/08/07 18:29:26 $
*
* Copyright (c) 1991-2001, Larry Wall
*
* You may distribute under the terms of either the GNU General Public
* License or the Artistic License, as specified in the README file.
*
* $Log: str.c,v $
*/
#include "EXTERN.h"
#include "a2p.h"
#include "util.h"
void
str_numset(register STR *str, double num)
{
str->str_nval = num;
str->str_pok = 0; /* invalidate pointer */
str->str_nok = 1; /* validate number */
}
char *
str_2ptr(register STR *str)
{
register char *s;
if (!str)
return "";
GROWSTR(&(str->str_ptr), &(str->str_len), 24);
s = str->str_ptr;
if (str->str_nok) {
sprintf(s,"%.20g",str->str_nval);
while (*s) s++;
}
*s = '\0';
str->str_cur = s - str->str_ptr;
str->str_pok = 1;
#ifdef DEBUGGING
if (debug & 32)
fprintf(stderr,"0x%lx ptr(%s)\n",(unsigned long)str,str->str_ptr);
#endif
return str->str_ptr;
}
double
str_2num(register STR *str)
{
if (!str)
return 0.0;
if (str->str_len && str->str_pok)
str->str_nval = atof(str->str_ptr);
else
str->str_nval = 0.0;
str->str_nok = 1;
#ifdef DEBUGGING
if (debug & 32)
fprintf(stderr,"0x%lx num(%g)\n",(unsigned long)str,str->str_nval);
#endif
return str->str_nval;
}
void
str_sset(STR *dstr, register STR *sstr)
{
if (!sstr)
str_nset(dstr,No,0);
else if (sstr->str_nok)
str_numset(dstr,sstr->str_nval);
else if (sstr->str_pok)
str_nset(dstr,sstr->str_ptr,sstr->str_cur);
else
str_nset(dstr,"",0);
}
void
str_nset(register STR *str, register char *ptr, register int len)
{
GROWSTR(&(str->str_ptr), &(str->str_len), len + 1);
bcopy(ptr,str->str_ptr,len);
str->str_cur = len;
*(str->str_ptr+str->str_cur) = '\0';
str->str_nok = 0; /* invalidate number */
str->str_pok = 1; /* validate pointer */
}
void
str_set(register STR *str, register char *ptr)
{
register int len;
if (!ptr)
ptr = "";
len = strlen(ptr);
GROWSTR(&(str->str_ptr), &(str->str_len), len + 1);
bcopy(ptr,str->str_ptr,len+1);
str->str_cur = len;
str->str_nok = 0; /* invalidate number */
str->str_pok = 1; /* validate pointer */
}
void
str_chop(register STR *str, register char *ptr) /* like set but assuming ptr is in str */
{
if (!(str->str_pok))
str_2ptr(str);
str->str_cur -= (ptr - str->str_ptr);
bcopy(ptr,str->str_ptr, str->str_cur + 1);
str->str_nok = 0; /* invalidate number */
str->str_pok = 1; /* validate pointer */
}
void
str_ncat(register STR *str, register char *ptr, register int len)
{
if (!(str->str_pok))
str_2ptr(str);
GROWSTR(&(str->str_ptr), &(str->str_len), str->str_cur + len + 1);
bcopy(ptr,str->str_ptr+str->str_cur,len);
str->str_cur += len;
*(str->str_ptr+str->str_cur) = '\0';
str->str_nok = 0; /* invalidate number */
str->str_pok = 1; /* validate pointer */
}
void
str_scat(STR *dstr, register STR *sstr)
{
if (!(sstr->str_pok))
str_2ptr(sstr);
if (sstr)
str_ncat(dstr,sstr->str_ptr,sstr->str_cur);
}
void
str_cat(register STR *str, register char *ptr)
{
register int len;
if (!ptr)
return;
if (!(str->str_pok))
str_2ptr(str);
len = strlen(ptr);
GROWSTR(&(str->str_ptr), &(str->str_len), str->str_cur + len + 1);
bcopy(ptr,str->str_ptr+str->str_cur,len+1);
str->str_cur += len;
str->str_nok = 0; /* invalidate number */
str->str_pok = 1; /* validate pointer */
}
char *
str_append_till(register STR *str, register char *from, register int delim, char *keeplist)
{
register char *to;
register int len;
if (!from)
return Nullch;
len = strlen(from);
GROWSTR(&(str->str_ptr), &(str->str_len), str->str_cur + len + 1);
str->str_nok = 0; /* invalidate number */
str->str_pok = 1; /* validate pointer */
to = str->str_ptr+str->str_cur;
for (; *from; from++,to++) {
if (*from == '\\' && from[1] && delim != '\\') {
if (!keeplist) {
if (from[1] == delim || from[1] == '\\')
from++;
else
*to++ = *from++;
}
else if (strchr(keeplist,from[1]))
*to++ = *from++;
else
from++;
}
else if (*from == delim)
break;
*to = *from;
}
*to = '\0';
str->str_cur = to - str->str_ptr;
return from;
}
STR *
str_new(int len)
{
register STR *str;
if (freestrroot) {
str = freestrroot;
freestrroot = str->str_link.str_next;
}
else {
str = (STR *) safemalloc(sizeof(STR));
bzero((char*)str,sizeof(STR));
}
if (len)
GROWSTR(&(str->str_ptr), &(str->str_len), len + 1);
return str;
}
void
str_grow(register STR *str, int len)
{
if (len && str)
GROWSTR(&(str->str_ptr), &(str->str_len), len + 1);
}
/* make str point to what nstr did */
void
str_replace(register STR *str, register STR *nstr)
{
safefree(str->str_ptr);
str->str_ptr = nstr->str_ptr;
str->str_len = nstr->str_len;
str->str_cur = nstr->str_cur;
str->str_pok = nstr->str_pok;
if (str->str_nok = nstr->str_nok)
str->str_nval = nstr->str_nval;
safefree((char*)nstr);
}
void
str_free(register STR *str)
{
if (!str)
return;
if (str->str_len)
str->str_ptr[0] = '\0';
str->str_cur = 0;
str->str_nok = 0;
str->str_pok = 0;
str->str_link.str_next = freestrroot;
freestrroot = str;
}
int
str_len(register STR *str)
{
if (!str)
return 0;
if (!(str->str_pok))
str_2ptr(str);
if (str->str_len)
return str->str_cur;
else
return 0;
}
char *
str_gets(register STR *str, register FILE *fp)
{
#if defined(USE_STDIO_PTR) && defined(STDIO_PTR_LVALUE) && defined(STDIO_CNT_LVALUE)
/* Here is some breathtakingly efficient cheating */
register char *bp; /* we're going to steal some values */
register int cnt; /* from the stdio struct and put EVERYTHING */
register STDCHAR *ptr; /* in the innermost loop into registers */
register char newline = '\n'; /* (assuming at least 6 registers) */
int i;
int bpx;
#if defined(VMS)
/* An ungetc()d char is handled separately from the regular
* buffer, so we getc() it back out and stuff it in the buffer.
*/
i = getc(fp);
if (i == EOF) return Nullch;
*(--((*fp)->_ptr)) = (unsigned char) i;
(*fp)->_cnt++;
#endif
cnt = FILE_cnt(fp); /* get count into register */
str->str_nok = 0; /* invalidate number */
str->str_pok = 1; /* validate pointer */
if (str->str_len <= cnt) /* make sure we have the room */
GROWSTR(&(str->str_ptr), &(str->str_len), cnt+1);
bp = str->str_ptr; /* move these two too to registers */
ptr = FILE_ptr(fp);
for (;;) {
while (--cnt >= 0) {
if ((*bp++ = *ptr++) == newline)
if (bp <= str->str_ptr || bp[-2] != '\\')
goto thats_all_folks;
else {
line++;
bp -= 2;
}
}
FILE_cnt(fp) = cnt; /* deregisterize cnt and ptr */
FILE_ptr(fp) = ptr;
i = getc(fp); /* get more characters */
cnt = FILE_cnt(fp);
ptr = FILE_ptr(fp); /* reregisterize cnt and ptr */
bpx = bp - str->str_ptr; /* prepare for possible relocation */
GROWSTR(&(str->str_ptr), &(str->str_len), str->str_cur + cnt + 1);
bp = str->str_ptr + bpx; /* reconstitute our pointer */
if (i == newline) { /* all done for now? */
*bp++ = i;
goto thats_all_folks;
}
else if (i == EOF) /* all done for ever? */
goto thats_all_folks;
*bp++ = i; /* now go back to screaming loop */
}
thats_all_folks:
FILE_cnt(fp) = cnt; /* put these back or we're in trouble */
FILE_ptr(fp) = ptr;
*bp = '\0';
str->str_cur = bp - str->str_ptr; /* set length */
#else /* USE_STDIO_PTR && STDIO_PTR_LVALUE && STDIO_CNT_LVALUE */
/* The big, slow, and stupid way */
static char buf[4192];
if (fgets(buf, sizeof buf, fp) != Nullch)
str_set(str, buf);
else
str_set(str, No);
#endif /* USE_STDIO_PTR && STDIO_PTR_LVALUE && STDIO_CNT_LVALUE */
return str->str_cur ? str->str_ptr : Nullch;
}
void
str_inc(register STR *str)
{
register char *d;
if (!str)
return;
if (str->str_nok) {
str->str_nval += 1.0;
str->str_pok = 0;
return;
}
if (!str->str_pok) {
str->str_nval = 1.0;
str->str_nok = 1;
return;
}
for (d = str->str_ptr; *d && *d != '.'; d++) ;
d--;
if (!isdigit(*str->str_ptr) || !isdigit(*d) ) {
str_numset(str,atof(str->str_ptr) + 1.0); /* punt */
return;
}
while (d >= str->str_ptr) {
if (++*d <= '9')
return;
*(d--) = '0';
}
/* oh,oh, the number grew */
GROWSTR(&(str->str_ptr), &(str->str_len), str->str_cur + 2);
str->str_cur++;
for (d = str->str_ptr + str->str_cur; d > str->str_ptr; d--)
*d = d[-1];
*d = '1';
}
void
str_dec(register STR *str)
{
register char *d;
if (!str)
return;
if (str->str_nok) {
str->str_nval -= 1.0;
str->str_pok = 0;
return;
}
if (!str->str_pok) {
str->str_nval = -1.0;
str->str_nok = 1;
return;
}
for (d = str->str_ptr; *d && *d != '.'; d++) ;
d--;
if (!isdigit(*str->str_ptr) || !isdigit(*d) || (*d == '0' && d == str->str_ptr)) {
str_numset(str,atof(str->str_ptr) - 1.0); /* punt */
return;
}
while (d >= str->str_ptr) {
if (--*d >= '0')
return;
*(d--) = '9';
}
}
/* make a string that will exist for the duration of the expression eval */
STR *
str_mortal(STR *oldstr)
{
register STR *str = str_new(0);
static long tmps_size = -1;
str_sset(str,oldstr);
if (++tmps_max > tmps_size) {
tmps_size = tmps_max;
if (!(tmps_size & 127)) {
if (tmps_size)
tmps_list = (STR**)saferealloc((char*)tmps_list,
(tmps_size + 128) * sizeof(STR*) );
else
tmps_list = (STR**)safemalloc(128 * sizeof(char*));
}
}
tmps_list[tmps_max] = str;
return str;
}
STR *
str_make(char *s)
{
register STR *str = str_new(0);
str_set(str,s);
return str;
}
STR *
str_nmake(double n)
{
register STR *str = str_new(0);
str_numset(str,n);
return str;
}