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/* str.c
*
* Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1999,
* 2001, 2002, 2005 by Larry Wall and others
*
* You may distribute under the terms of either the GNU General Public
* License or the Artistic License, as specified in the README file.
*/
#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 (char *)""; /* probably safe - won't be written to */
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;
}
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 const char *ptr, register int len)
{
GROWSTR(&(str->str_ptr), &(str->str_len), len + 1);
memcpy(str->str_ptr,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 const char *ptr)
{
register int len;
if (!ptr)
ptr = "";
len = strlen(ptr);
GROWSTR(&(str->str_ptr), &(str->str_len), len + 1);
memcpy(str->str_ptr,ptr,len+1);
str->str_cur = len;
str->str_nok = 0; /* invalidate number */
str->str_pok = 1; /* validate pointer */
}
void
str_ncat(register STR *str, register const char *ptr, register int len)
{
if (!(str->str_pok))
str_2ptr(str);
GROWSTR(&(str->str_ptr), &(str->str_len), str->str_cur + len + 1);
memcpy(str->str_ptr+str->str_cur, 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_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 const 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);
memcpy(str->str_ptr+str->str_cur, ptr, len+1);
str->str_cur += len;
str->str_nok = 0; /* invalidate number */
str->str_pok = 1; /* validate pointer */
}
STR *
str_new(int len)
{
register STR *str;
if (freestrroot) {
str = freestrroot;
freestrroot = str->str_link.str_next;
}
else {
str = (STR *) safemalloc(sizeof(STR));
memset((char*)str,0,sizeof(STR));
}
if (len)
GROWSTR(&(str->str_ptr), &(str->str_len), len + 1);
return str;
}
/* make str point to what nstr did */
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 = (STDCHAR*)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) = (void*)ptr; /* LHS STDCHAR* cast non-portable */
i = getc(fp); /* get more characters */
cnt = FILE_cnt(fp);
ptr = (STDCHAR*)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) = (void*)ptr; /* LHS STDCHAR* cast non-portable */
*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;
}
STR *
str_make(const char *s)
{
register STR *str = str_new(0);
str_set(str,s);
return str;
}
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