[perl5.git] / x2p / str.c

/* $RCSfile: str.c,v $$Revision: 4.1 $$Date: 92/08/07 18:29:26 $
 *
 *    Copyright (c) 1991-1997, 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;
}
Commit	Line	Data
79072805	1	/* $RCSfile: str.c,v $$Revision: 4.1 $$Date: 92/08/07 18:29:26 $
a687059c	2	*
9607fc9c	3	* Copyright (c) 1991-1997, Larry Wall
a687059c	4	*
d48672a2 LW	5	* You may distribute under the terms of either the GNU General Public
d48672a2 LW	6	* License or the Artistic License, as specified in the README file.
8d063cd8 LW	7	*
8d063cd8 LW	8	* $Log: str.c,v $
8d063cd8 LW	9	*/
8d063cd8 LW	10
8d063cd8	11	#include "EXTERN.h"
8d063cd8	12	#include "a2p.h"
9c8d0b29	13	#include "util.h"
8d063cd8	14
9c8d0b29	15	void
f0f333f4	16	str_numset(register STR *str, double num)
8d063cd8 LW	17	{
	18	str->str_nval = num;
	19	str->str_pok = 0; /* invalidate pointer */
	20	str->str_nok = 1; /* validate number */
	21	}
	22
	23	char *
f0f333f4	24	str_2ptr(register STR *str)
8d063cd8 LW	25	{
	26	register char *s;
	27
	28	if (!str)
	29	return "";
	30	GROWSTR(&(str->str_ptr), &(str->str_len), 24);
	31	s = str->str_ptr;
	32	if (str->str_nok) {
	33	sprintf(s,"%.20g",str->str_nval);
	34	while (*s) s++;
	35	}
	36	*s = '\0';
	37	str->str_cur = s - str->str_ptr;
	38	str->str_pok = 1;
	39	#ifdef DEBUGGING
	40	if (debug & 32)
68dc0745	41	fprintf(stderr,"0x%lx ptr(%s)\n",(unsigned long)str,str->str_ptr);
8d063cd8 LW	42	#endif
	43	return str->str_ptr;
	44	}
	45
	46	double
f0f333f4	47	str_2num(register STR *str)
8d063cd8 LW	48	{
	49	if (!str)
	50	return 0.0;
	51	if (str->str_len && str->str_pok)
	52	str->str_nval = atof(str->str_ptr);
	53	else
	54	str->str_nval = 0.0;
	55	str->str_nok = 1;
	56	#ifdef DEBUGGING
	57	if (debug & 32)
68dc0745	58	fprintf(stderr,"0x%lx num(%g)\n",(unsigned long)str,str->str_nval);
8d063cd8 LW	59	#endif
	60	return str->str_nval;
	61	}
	62
9c8d0b29	63	void
f0f333f4	64	str_sset(STR dstr, register STR sstr)
8d063cd8 LW	65	{
	66	if (!sstr)
	67	str_nset(dstr,No,0);
	68	else if (sstr->str_nok)
	69	str_numset(dstr,sstr->str_nval);
	70	else if (sstr->str_pok)
	71	str_nset(dstr,sstr->str_ptr,sstr->str_cur);
	72	else
	73	str_nset(dstr,"",0);
	74	}
	75
9c8d0b29	76	void
f0f333f4	77	str_nset(register STR str, register char ptr, register int len)
8d063cd8 LW	78	{
	79	GROWSTR(&(str->str_ptr), &(str->str_len), len + 1);
	80	bcopy(ptr,str->str_ptr,len);
	81	str->str_cur = len;
	82	*(str->str_ptr+str->str_cur) = '\0';
	83	str->str_nok = 0; /* invalidate number */
	84	str->str_pok = 1; /* validate pointer */
	85	}
	86
9c8d0b29	87	void
f0f333f4	88	str_set(register STR str, register char ptr)
8d063cd8 LW	89	{
	90	register int len;
	91
	92	if (!ptr)
	93	ptr = "";
	94	len = strlen(ptr);
	95	GROWSTR(&(str->str_ptr), &(str->str_len), len + 1);
	96	bcopy(ptr,str->str_ptr,len+1);
	97	str->str_cur = len;
	98	str->str_nok = 0; /* invalidate number */
	99	str->str_pok = 1; /* validate pointer */
	100	}
	101
9c8d0b29	102	void
f0f333f4 NIS	103	str_chop(register STR str, register char ptr) /* like set but assuming ptr is in str */
	104
	105
8d063cd8 LW	106	{
	107	if (!(str->str_pok))
	108	str_2ptr(str);
	109	str->str_cur -= (ptr - str->str_ptr);
	110	bcopy(ptr,str->str_ptr, str->str_cur + 1);
	111	str->str_nok = 0; /* invalidate number */
	112	str->str_pok = 1; /* validate pointer */
	113	}
	114
9c8d0b29	115	void
f0f333f4	116	str_ncat(register STR str, register char ptr, register int len)
8d063cd8 LW	117	{
	118	if (!(str->str_pok))
	119	str_2ptr(str);
	120	GROWSTR(&(str->str_ptr), &(str->str_len), str->str_cur + len + 1);
	121	bcopy(ptr,str->str_ptr+str->str_cur,len);
	122	str->str_cur += len;
	123	*(str->str_ptr+str->str_cur) = '\0';
	124	str->str_nok = 0; /* invalidate number */
	125	str->str_pok = 1; /* validate pointer */
	126	}
	127
9c8d0b29	128	void
f0f333f4	129	str_scat(STR dstr, register STR sstr)
8d063cd8 LW	130	{
	131	if (!(sstr->str_pok))
	132	str_2ptr(sstr);
	133	if (sstr)
	134	str_ncat(dstr,sstr->str_ptr,sstr->str_cur);
	135	}
	136
9c8d0b29	137	void
f0f333f4	138	str_cat(register STR str, register char ptr)
8d063cd8 LW	139	{
	140	register int len;
	141
	142	if (!ptr)
	143	return;
	144	if (!(str->str_pok))
	145	str_2ptr(str);
	146	len = strlen(ptr);
	147	GROWSTR(&(str->str_ptr), &(str->str_len), str->str_cur + len + 1);
	148	bcopy(ptr,str->str_ptr+str->str_cur,len+1);
	149	str->str_cur += len;
	150	str->str_nok = 0; /* invalidate number */
	151	str->str_pok = 1; /* validate pointer */
	152	}
	153
	154	char *
f0f333f4	155	str_append_till(register STR str, register char from, register int delim, char *keeplist)
8d063cd8 LW	156	{
	157	register char *to;
	158	register int len;
	159
	160	if (!from)
	161	return Nullch;
	162	len = strlen(from);
	163	GROWSTR(&(str->str_ptr), &(str->str_len), str->str_cur + len + 1);
	164	str->str_nok = 0; /* invalidate number */
	165	str->str_pok = 1; /* validate pointer */
	166	to = str->str_ptr+str->str_cur;
	167	for (; *from; from++,to++) {
	168	if (*from == '\\' && from[1] && delim != '\\') {
	169	if (!keeplist) {
	170	if (from[1] == delim \|\| from[1] == '\\')
	171	from++;
	172	else
	173	to++ = from++;
	174	}
a0d0e21e	175	else if (strchr(keeplist,from[1]))
8d063cd8 LW	176	to++ = from++;
	177	else
	178	from++;
	179	}
	180	else if (*from == delim)
	181	break;
	182	to = from;
	183	}
	184	*to = '\0';
	185	str->str_cur = to - str->str_ptr;
	186	return from;
	187	}
	188
	189	STR *
f0f333f4	190	str_new(int len)
8d063cd8 LW	191	{
	192	register STR *str;
	193
	194	if (freestrroot) {
	195	str = freestrroot;
	196	freestrroot = str->str_link.str_next;
	197	}
	198	else {
	199	str = (STR *) safemalloc(sizeof(STR));
	200	bzero((char*)str,sizeof(STR));
	201	}
	202	if (len)
	203	GROWSTR(&(str->str_ptr), &(str->str_len), len + 1);
	204	return str;
	205	}
	206
	207	void
f0f333f4	208	str_grow(register STR *str, int len)
8d063cd8 LW	209	{
	210	if (len && str)
	211	GROWSTR(&(str->str_ptr), &(str->str_len), len + 1);
	212	}
	213
	214	/* make str point to what nstr did */
	215
	216	void
f0f333f4	217	str_replace(register STR str, register STR nstr)
8d063cd8	218	{
5e212cb5	219	safefree(str->str_ptr);
8d063cd8 LW	220	str->str_ptr = nstr->str_ptr;
	221	str->str_len = nstr->str_len;
	222	str->str_cur = nstr->str_cur;
	223	str->str_pok = nstr->str_pok;
	224	if (str->str_nok = nstr->str_nok)
	225	str->str_nval = nstr->str_nval;
	226	safefree((char*)nstr);
	227	}
	228
	229	void
f0f333f4	230	str_free(register STR *str)
8d063cd8 LW	231	{
	232	if (!str)
	233	return;
	234	if (str->str_len)
	235	str->str_ptr[0] = '\0';
	236	str->str_cur = 0;
	237	str->str_nok = 0;
	238	str->str_pok = 0;
	239	str->str_link.str_next = freestrroot;
	240	freestrroot = str;
	241	}
	242
9c8d0b29	243	int
f0f333f4	244	str_len(register STR *str)
8d063cd8 LW	245	{
	246	if (!str)
	247	return 0;
	248	if (!(str->str_pok))
	249	str_2ptr(str);
	250	if (str->str_len)
	251	return str->str_cur;
	252	else
	253	return 0;
	254	}
	255
	256	char *
f0f333f4	257	str_gets(register STR str, register FILE fp)
8d063cd8	258	{
c2960299 AD	259	#if defined(USE_STDIO_PTR) && defined(STDIO_PTR_LVALUE) && defined(STDIO_CNT_LVALUE)
c2960299 AD	260	/* Here is some breathtakingly efficient cheating */
8d063cd8 LW	261
	262	register char bp; / we're going to steal some values */
	263	register int cnt; /* from the stdio struct and put EVERYTHING */
378cc40b	264	register STDCHAR ptr; / in the innermost loop into registers */
8d063cd8 LW	265	register char newline = '\n'; /* (assuming at least 6 registers) */
	266	int i;
	267	int bpx;
	268
44a8e56a	269	#if defined(VMS)
	270	/* An ungetc()d char is handled separately from the regular
	271	* buffer, so we getc() it back out and stuff it in the buffer.
	272	*/
	273	i = getc(fp);
	274	if (i == EOF) return Nullch;
	275	(--((fp)->_ptr)) = (unsigned char) i;
	276	(*fp)->_cnt++;
	277	#endif
	278
16d20bd9	279	cnt = FILE_cnt(fp); /* get count into register */
8d063cd8 LW	280	str->str_nok = 0; /* invalidate number */
	281	str->str_pok = 1; /* validate pointer */
	282	if (str->str_len <= cnt) /* make sure we have the room */
	283	GROWSTR(&(str->str_ptr), &(str->str_len), cnt+1);
	284	bp = str->str_ptr; /* move these two too to registers */
16d20bd9	285	ptr = FILE_ptr(fp);
8d063cd8	286	for (;;) {
378cc40b LW	287	while (--cnt >= 0) {
	288	if ((bp++ = ptr++) == newline)
	289	if (bp <= str->str_ptr \|\| bp[-2] != '\\')
	290	goto thats_all_folks;
	291	else {
	292	line++;
	293	bp -= 2;
	294	}
8d063cd8 LW	295	}
8d063cd8 LW	296
16d20bd9 AD	297	FILE_cnt(fp) = cnt; /* deregisterize cnt and ptr */
16d20bd9 AD	298	FILE_ptr(fp) = ptr;
44a8e56a	299	i = getc(fp); /* get more characters */
16d20bd9 AD	300	cnt = FILE_cnt(fp);
16d20bd9 AD	301	ptr = FILE_ptr(fp); /* reregisterize cnt and ptr */
8d063cd8 LW	302
	303	bpx = bp - str->str_ptr; /* prepare for possible relocation */
	304	GROWSTR(&(str->str_ptr), &(str->str_len), str->str_cur + cnt + 1);
	305	bp = str->str_ptr + bpx; /* reconstitute our pointer */
	306
	307	if (i == newline) { /* all done for now? */
	308	*bp++ = i;
	309	goto thats_all_folks;
	310	}
	311	else if (i == EOF) /* all done for ever? */
	312	goto thats_all_folks;
	313	bp++ = i; / now go back to screaming loop */
	314	}
	315
	316	thats_all_folks:
16d20bd9 AD	317	FILE_cnt(fp) = cnt; /* put these back or we're in trouble */
16d20bd9 AD	318	FILE_ptr(fp) = ptr;
8d063cd8 LW	319	*bp = '\0';
	320	str->str_cur = bp - str->str_ptr; /* set length */
	321
c2960299 AD	322	#else /* USE_STDIO_PTR && STDIO_PTR_LVALUE && STDIO_CNT_LVALUE */
c2960299 AD	323	/* The big, slow, and stupid way */
8d063cd8 LW	324
	325	static char buf[4192];
	326
	327	if (fgets(buf, sizeof buf, fp) != Nullch)
	328	str_set(str, buf);
	329	else
	330	str_set(str, No);
	331
c2960299	332	#endif /* USE_STDIO_PTR && STDIO_PTR_LVALUE && STDIO_CNT_LVALUE */
8d063cd8 LW	333
	334	return str->str_cur ? str->str_ptr : Nullch;
	335	}
	336
	337	void
f0f333f4	338	str_inc(register STR *str)
8d063cd8 LW	339	{
	340	register char *d;
	341
	342	if (!str)
	343	return;
	344	if (str->str_nok) {
	345	str->str_nval += 1.0;
	346	str->str_pok = 0;
	347	return;
	348	}
	349	if (!str->str_pok) {
	350	str->str_nval = 1.0;
	351	str->str_nok = 1;
	352	return;
	353	}
	354	for (d = str->str_ptr; d && d != '.'; d++) ;
	355	d--;
	356	if (!isdigit(str->str_ptr) \|\| !isdigit(d) ) {
	357	str_numset(str,atof(str->str_ptr) + 1.0); /* punt */
	358	return;
	359	}
	360	while (d >= str->str_ptr) {
	361	if (++*d <= '9')
	362	return;
	363	*(d--) = '0';
	364	}
	365	/* oh,oh, the number grew */
	366	GROWSTR(&(str->str_ptr), &(str->str_len), str->str_cur + 2);
	367	str->str_cur++;
	368	for (d = str->str_ptr + str->str_cur; d > str->str_ptr; d--)
	369	*d = d[-1];
	370	*d = '1';
	371	}
	372
	373	void
f0f333f4	374	str_dec(register STR *str)
8d063cd8 LW	375	{
	376	register char *d;
	377
	378	if (!str)
	379	return;
	380	if (str->str_nok) {
	381	str->str_nval -= 1.0;
	382	str->str_pok = 0;
	383	return;
	384	}
	385	if (!str->str_pok) {
	386	str->str_nval = -1.0;
	387	str->str_nok = 1;
	388	return;
	389	}
	390	for (d = str->str_ptr; d && d != '.'; d++) ;
	391	d--;
	392	if (!isdigit(str->str_ptr) \|\| !isdigit(d) \|\| (*d == '0' && d == str->str_ptr)) {
	393	str_numset(str,atof(str->str_ptr) - 1.0); /* punt */
	394	return;
	395	}
	396	while (d >= str->str_ptr) {
	397	if (--*d >= '0')
	398	return;
	399	*(d--) = '9';
	400	}
	401	}
	402
	403	/* make a string that will exist for the duration of the expression eval */
	404
	405	STR *
f0f333f4	406	str_mortal(STR *oldstr)
8d063cd8 LW	407	{
	408	register STR *str = str_new(0);
	409	static long tmps_size = -1;
	410
	411	str_sset(str,oldstr);
	412	if (++tmps_max > tmps_size) {
	413	tmps_size = tmps_max;
	414	if (!(tmps_size & 127)) {
	415	if (tmps_size)
	416	tmps_list = (STR*)saferealloc((char)tmps_list,
	417	(tmps_size + 128) * sizeof(STR*) );
	418	else
	419	tmps_list = (STR*)safemalloc(128 sizeof(char*));
	420	}
	421	}
	422	tmps_list[tmps_max] = str;
	423	return str;
	424	}
	425
	426	STR *
f0f333f4	427	str_make(char *s)
8d063cd8 LW	428	{
	429	register STR *str = str_new(0);
	430
	431	str_set(str,s);
	432	return str;
	433	}
	434
	435	STR *
f0f333f4	436	str_nmake(double n)
8d063cd8 LW	437	{
	438	register STR *str = str_new(0);
	439
	440	str_numset(str,n);
	441	return str;
	442	}