[p5sagit/p5-mst-13.2.git] / x2p / str.c

/* $RCSfile: str.c,v $$Revision: 4.1 $$Date: 92/08/07 18:29:26 $
 *
 *    Copyright (c) 1991, 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(str,num)
register STR *str;
double num;
{
    str->str_nval = num;
    str->str_pok = 0;		/* invalidate pointer */
    str->str_nok = 1;		/* validate number */
}

char *
str_2ptr(str)
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",str,str->str_ptr);
#endif
    return str->str_ptr;
}

double
str_2num(str)
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",str,str->str_nval);
#endif
    return str->str_nval;
}

void
str_sset(dstr,sstr)
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(str,ptr,len)
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(str,ptr)
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(str,ptr)	/* like set but assuming ptr is in str */
register STR *str;
register char *ptr;
{
    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(str,ptr,len)
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(dstr,sstr)
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(str,ptr)
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(str,from,delim,keeplist)
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(len)
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(str,len)
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(str,nstr)
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(str)
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(str)
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(str,fp)
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;

    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 = FILE_filbuf(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(str)
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(str)
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(oldstr)
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(s)
char *s;
{
    register STR *str = str_new(0);

    str_set(str,s);
    return str;
}

STR *
str_nmake(n)
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	*
d48672a2	3	* Copyright (c) 1991, Larry Wall
a687059c	4	*
d48672a2	5	* You may distribute under the terms of either the GNU General Public
d48672a2	6	* License or the Artistic License, as specified in the README file.
8d063cd8	7	*
8d063cd8	8	* $Log: str.c,v $
8d063cd8	9	*/
8d063cd8	10
8d063cd8	11	#include "EXTERN.h"
8d063cd8	12	#include "a2p.h"
9c8d0b29	13	#include "util.h"
8d063cd8	14
9c8d0b29	15	void
8d063cd8	16	str_numset(str,num)
	17	register STR *str;
	18	double num;
	19	{
	20	str->str_nval = num;
	21	str->str_pok = 0; /* invalidate pointer */
	22	str->str_nok = 1; /* validate number */
	23	}
	24
	25	char *
	26	str_2ptr(str)
	27	register STR *str;
	28	{
	29	register char *s;
	30
	31	if (!str)
	32	return "";
	33	GROWSTR(&(str->str_ptr), &(str->str_len), 24);
	34	s = str->str_ptr;
	35	if (str->str_nok) {
	36	sprintf(s,"%.20g",str->str_nval);
	37	while (*s) s++;
	38	}
	39	*s = '\0';
	40	str->str_cur = s - str->str_ptr;
	41	str->str_pok = 1;
	42	#ifdef DEBUGGING
	43	if (debug & 32)
	44	fprintf(stderr,"0x%lx ptr(%s)\n",str,str->str_ptr);
	45	#endif
	46	return str->str_ptr;
	47	}
	48
	49	double
	50	str_2num(str)
	51	register STR *str;
	52	{
	53	if (!str)
	54	return 0.0;
	55	if (str->str_len && str->str_pok)
	56	str->str_nval = atof(str->str_ptr);
	57	else
	58	str->str_nval = 0.0;
	59	str->str_nok = 1;
	60	#ifdef DEBUGGING
	61	if (debug & 32)
	62	fprintf(stderr,"0x%lx num(%g)\n",str,str->str_nval);
	63	#endif
	64	return str->str_nval;
	65	}
	66
9c8d0b29	67	void
8d063cd8	68	str_sset(dstr,sstr)
	69	STR *dstr;
	70	register STR *sstr;
	71	{
	72	if (!sstr)
	73	str_nset(dstr,No,0);
	74	else if (sstr->str_nok)
	75	str_numset(dstr,sstr->str_nval);
	76	else if (sstr->str_pok)
	77	str_nset(dstr,sstr->str_ptr,sstr->str_cur);
	78	else
	79	str_nset(dstr,"",0);
	80	}
	81
9c8d0b29	82	void
8d063cd8	83	str_nset(str,ptr,len)
	84	register STR *str;
	85	register char *ptr;
	86	register int len;
	87	{
	88	GROWSTR(&(str->str_ptr), &(str->str_len), len + 1);
	89	bcopy(ptr,str->str_ptr,len);
	90	str->str_cur = len;
	91	*(str->str_ptr+str->str_cur) = '\0';
	92	str->str_nok = 0; /* invalidate number */
	93	str->str_pok = 1; /* validate pointer */
	94	}
	95
9c8d0b29	96	void
8d063cd8	97	str_set(str,ptr)
	98	register STR *str;
	99	register char *ptr;
	100	{
	101	register int len;
	102
	103	if (!ptr)
	104	ptr = "";
	105	len = strlen(ptr);
	106	GROWSTR(&(str->str_ptr), &(str->str_len), len + 1);
	107	bcopy(ptr,str->str_ptr,len+1);
	108	str->str_cur = len;
	109	str->str_nok = 0; /* invalidate number */
	110	str->str_pok = 1; /* validate pointer */
	111	}
	112
9c8d0b29	113	void
8d063cd8	114	str_chop(str,ptr) /* like set but assuming ptr is in str */
	115	register STR *str;
	116	register char *ptr;
	117	{
	118	if (!(str->str_pok))
	119	str_2ptr(str);
	120	str->str_cur -= (ptr - str->str_ptr);
	121	bcopy(ptr,str->str_ptr, str->str_cur + 1);
	122	str->str_nok = 0; /* invalidate number */
	123	str->str_pok = 1; /* validate pointer */
	124	}
	125
9c8d0b29	126	void
8d063cd8	127	str_ncat(str,ptr,len)
	128	register STR *str;
	129	register char *ptr;
	130	register int len;
	131	{
	132	if (!(str->str_pok))
	133	str_2ptr(str);
	134	GROWSTR(&(str->str_ptr), &(str->str_len), str->str_cur + len + 1);
	135	bcopy(ptr,str->str_ptr+str->str_cur,len);
	136	str->str_cur += len;
	137	*(str->str_ptr+str->str_cur) = '\0';
	138	str->str_nok = 0; /* invalidate number */
	139	str->str_pok = 1; /* validate pointer */
	140	}
	141
9c8d0b29	142	void
8d063cd8	143	str_scat(dstr,sstr)
	144	STR *dstr;
	145	register STR *sstr;
	146	{
	147	if (!(sstr->str_pok))
	148	str_2ptr(sstr);
	149	if (sstr)
	150	str_ncat(dstr,sstr->str_ptr,sstr->str_cur);
	151	}
	152
9c8d0b29	153	void
8d063cd8	154	str_cat(str,ptr)
	155	register STR *str;
	156	register char *ptr;
	157	{
	158	register int len;
	159
	160	if (!ptr)
	161	return;
	162	if (!(str->str_pok))
	163	str_2ptr(str);
	164	len = strlen(ptr);
	165	GROWSTR(&(str->str_ptr), &(str->str_len), str->str_cur + len + 1);
	166	bcopy(ptr,str->str_ptr+str->str_cur,len+1);
	167	str->str_cur += len;
	168	str->str_nok = 0; /* invalidate number */
	169	str->str_pok = 1; /* validate pointer */
	170	}
	171
	172	char *
	173	str_append_till(str,from,delim,keeplist)
	174	register STR *str;
	175	register char *from;
	176	register int delim;
	177	char *keeplist;
	178	{
	179	register char *to;
	180	register int len;
	181
	182	if (!from)
	183	return Nullch;
	184	len = strlen(from);
	185	GROWSTR(&(str->str_ptr), &(str->str_len), str->str_cur + len + 1);
	186	str->str_nok = 0; /* invalidate number */
	187	str->str_pok = 1; /* validate pointer */
	188	to = str->str_ptr+str->str_cur;
	189	for (; *from; from++,to++) {
	190	if (*from == '\\' && from[1] && delim != '\\') {
	191	if (!keeplist) {
	192	if (from[1] == delim \|\| from[1] == '\\')
	193	from++;
	194	else
	195	to++ = from++;
	196	}
a0d0e21e	197	else if (strchr(keeplist,from[1]))
8d063cd8	198	to++ = from++;
	199	else
	200	from++;
	201	}
	202	else if (*from == delim)
	203	break;
	204	to = from;
	205	}
	206	*to = '\0';
	207	str->str_cur = to - str->str_ptr;
	208	return from;
	209	}
	210
	211	STR *
	212	str_new(len)
	213	int len;
	214	{
	215	register STR *str;
	216
	217	if (freestrroot) {
	218	str = freestrroot;
	219	freestrroot = str->str_link.str_next;
	220	}
	221	else {
	222	str = (STR *) safemalloc(sizeof(STR));
	223	bzero((char*)str,sizeof(STR));
	224	}
	225	if (len)
	226	GROWSTR(&(str->str_ptr), &(str->str_len), len + 1);
	227	return str;
	228	}
	229
	230	void
	231	str_grow(str,len)
	232	register STR *str;
	233	int len;
	234	{
	235	if (len && str)
	236	GROWSTR(&(str->str_ptr), &(str->str_len), len + 1);
	237	}
	238
	239	/* make str point to what nstr did */
	240
	241	void
	242	str_replace(str,nstr)
	243	register STR *str;
	244	register STR *nstr;
	245	{
9c8d0b29	246	Safefree(str->str_ptr);
8d063cd8	247	str->str_ptr = nstr->str_ptr;
	248	str->str_len = nstr->str_len;
	249	str->str_cur = nstr->str_cur;
	250	str->str_pok = nstr->str_pok;
	251	if (str->str_nok = nstr->str_nok)
	252	str->str_nval = nstr->str_nval;
	253	safefree((char*)nstr);
	254	}
	255
	256	void
	257	str_free(str)
	258	register STR *str;
	259	{
	260	if (!str)
	261	return;
	262	if (str->str_len)
	263	str->str_ptr[0] = '\0';
	264	str->str_cur = 0;
	265	str->str_nok = 0;
	266	str->str_pok = 0;
	267	str->str_link.str_next = freestrroot;
	268	freestrroot = str;
	269	}
	270
9c8d0b29	271	int
8d063cd8	272	str_len(str)
	273	register STR *str;
	274	{
	275	if (!str)
	276	return 0;
	277	if (!(str->str_pok))
	278	str_2ptr(str);
	279	if (str->str_len)
	280	return str->str_cur;
	281	else
	282	return 0;
	283	}
	284
	285	char *
	286	str_gets(str,fp)
	287	register STR *str;
	288	register FILE *fp;
	289	{
c2960299	290	#if defined(USE_STDIO_PTR) && defined(STDIO_PTR_LVALUE) && defined(STDIO_CNT_LVALUE)
c2960299	291	/* Here is some breathtakingly efficient cheating */
8d063cd8	292
	293	register char bp; / we're going to steal some values */
	294	register int cnt; /* from the stdio struct and put EVERYTHING */
378cc40b	295	register STDCHAR ptr; / in the innermost loop into registers */
8d063cd8	296	register char newline = '\n'; /* (assuming at least 6 registers) */
	297	int i;
	298	int bpx;
	299
16d20bd9	300	cnt = FILE_cnt(fp); /* get count into register */
8d063cd8	301	str->str_nok = 0; /* invalidate number */
	302	str->str_pok = 1; /* validate pointer */
	303	if (str->str_len <= cnt) /* make sure we have the room */
	304	GROWSTR(&(str->str_ptr), &(str->str_len), cnt+1);
	305	bp = str->str_ptr; /* move these two too to registers */
16d20bd9	306	ptr = FILE_ptr(fp);
8d063cd8	307	for (;;) {
378cc40b	308	while (--cnt >= 0) {
	309	if ((bp++ = ptr++) == newline)
	310	if (bp <= str->str_ptr \|\| bp[-2] != '\\')
	311	goto thats_all_folks;
	312	else {
	313	line++;
	314	bp -= 2;
	315	}
8d063cd8	316	}
8d063cd8	317
16d20bd9	318	FILE_cnt(fp) = cnt; /* deregisterize cnt and ptr */
16d20bd9	319	FILE_ptr(fp) = ptr;
8971618e	320	i = FILE_filbuf(fp); /* get more characters */
16d20bd9	321	cnt = FILE_cnt(fp);
16d20bd9	322	ptr = FILE_ptr(fp); /* reregisterize cnt and ptr */
8d063cd8	323
	324	bpx = bp - str->str_ptr; /* prepare for possible relocation */
	325	GROWSTR(&(str->str_ptr), &(str->str_len), str->str_cur + cnt + 1);
	326	bp = str->str_ptr + bpx; /* reconstitute our pointer */
	327
	328	if (i == newline) { /* all done for now? */
	329	*bp++ = i;
	330	goto thats_all_folks;
	331	}
	332	else if (i == EOF) /* all done for ever? */
	333	goto thats_all_folks;
	334	bp++ = i; / now go back to screaming loop */
	335	}
	336
	337	thats_all_folks:
16d20bd9	338	FILE_cnt(fp) = cnt; /* put these back or we're in trouble */
16d20bd9	339	FILE_ptr(fp) = ptr;
8d063cd8	340	*bp = '\0';
	341	str->str_cur = bp - str->str_ptr; /* set length */
	342
c2960299	343	#else /* USE_STDIO_PTR && STDIO_PTR_LVALUE && STDIO_CNT_LVALUE */
c2960299	344	/* The big, slow, and stupid way */
8d063cd8	345
	346	static char buf[4192];
	347
	348	if (fgets(buf, sizeof buf, fp) != Nullch)
	349	str_set(str, buf);
	350	else
	351	str_set(str, No);
	352
c2960299	353	#endif /* USE_STDIO_PTR && STDIO_PTR_LVALUE && STDIO_CNT_LVALUE */
8d063cd8	354
	355	return str->str_cur ? str->str_ptr : Nullch;
	356	}
	357
	358	void
	359	str_inc(str)
	360	register STR *str;
	361	{
	362	register char *d;
	363
	364	if (!str)
	365	return;
	366	if (str->str_nok) {
	367	str->str_nval += 1.0;
	368	str->str_pok = 0;
	369	return;
	370	}
	371	if (!str->str_pok) {
	372	str->str_nval = 1.0;
	373	str->str_nok = 1;
	374	return;
	375	}
	376	for (d = str->str_ptr; d && d != '.'; d++) ;
	377	d--;
	378	if (!isdigit(str->str_ptr) \|\| !isdigit(d) ) {
	379	str_numset(str,atof(str->str_ptr) + 1.0); /* punt */
	380	return;
	381	}
	382	while (d >= str->str_ptr) {
	383	if (++*d <= '9')
	384	return;
	385	*(d--) = '0';
	386	}
	387	/* oh,oh, the number grew */
	388	GROWSTR(&(str->str_ptr), &(str->str_len), str->str_cur + 2);
	389	str->str_cur++;
	390	for (d = str->str_ptr + str->str_cur; d > str->str_ptr; d--)
	391	*d = d[-1];
	392	*d = '1';
	393	}
	394
	395	void
	396	str_dec(str)
	397	register STR *str;
	398	{
	399	register char *d;
	400
	401	if (!str)
	402	return;
	403	if (str->str_nok) {
	404	str->str_nval -= 1.0;
	405	str->str_pok = 0;
	406	return;
	407	}
	408	if (!str->str_pok) {
	409	str->str_nval = -1.0;
	410	str->str_nok = 1;
	411	return;
	412	}
	413	for (d = str->str_ptr; d && d != '.'; d++) ;
	414	d--;
	415	if (!isdigit(str->str_ptr) \|\| !isdigit(d) \|\| (*d == '0' && d == str->str_ptr)) {
	416	str_numset(str,atof(str->str_ptr) - 1.0); /* punt */
	417	return;
418	}
419	while (d >= str->str_ptr) {
420	if (--*d >= '0')
421	return;
422	*(d--) = '9';
423	}
424	}
425
426	/* make a string that will exist for the duration of the expression eval */
427
428	STR *
fe14fcc3	429	str_mortal(oldstr)
8d063cd8	430	STR *oldstr;
	431	{
	432	register STR *str = str_new(0);
	433	static long tmps_size = -1;
	434
	435	str_sset(str,oldstr);
	436	if (++tmps_max > tmps_size) {
	437	tmps_size = tmps_max;
	438	if (!(tmps_size & 127)) {
	439	if (tmps_size)
	440	tmps_list = (STR*)saferealloc((char)tmps_list,
	441	(tmps_size + 128) * sizeof(STR*) );
	442	else
	443	tmps_list = (STR*)safemalloc(128 sizeof(char*));
	444	}
	445	}
	446	tmps_list[tmps_max] = str;
	447	return str;
	448	}
	449
	450	STR *
	451	str_make(s)
	452	char *s;
	453	{
	454	register STR *str = str_new(0);
	455
	456	str_set(str,s);
	457	return str;
	458	}
	459
	460	STR *
	461	str_nmake(n)
	462	double n;
	463	{
	464	register STR *str = str_new(0);
	465
	466	str_numset(str,n);
	467	return str;
	468	}