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misc.c revision 1.5 
      1 /*
      2  * Copyright (c) 1989, 1993
      3  *	The Regents of the University of California.  All rights reserved.
      4  *
      5  * This code is derived from software contributed to Berkeley by
      6  * Ozan Yigit at York University.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  * 3. All advertising materials mentioning features or use of this software
     17  *    must display the following acknowledgement:
     18  *	This product includes software developed by the University of
     19  *	California, Berkeley and its contributors.
     20  * 4. Neither the name of the University nor the names of its contributors
     21  *    may be used to endorse or promote products derived from this software
     22  *    without specific prior written permission.
     23  *
     24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     34  * SUCH DAMAGE.
     35  */
     36 
     37 #ifndef lint
     38 static char sccsid[] = "@(#)misc.c	8.1 (Berkeley) 6/6/93";
     39 #endif /* not lint */
     40 
     41 #include <sys/types.h>
     42 #include <errno.h>
     43 #include <unistd.h>
     44 #include <stdio.h>
     45 #include <stdlib.h>
     46 #include <string.h>
     47 #include "mdef.h"
     48 #include "stdd.h"
     49 #include "extern.h"
     50 #include "pathnames.h"
     51 
     52 /*
     53  * find the index of second str in the first str.
     54  */
     55 int
     56 indx(s1, s2)
     57 char *s1;
     58 char *s2;
     59 {
     60 	register char *t;
     61 	register char *p;
     62 	register char *m;
     63 
     64 	for (p = s1; *p; p++) {
     65 		for (t = p, m = s2; *m && *m == *t; m++, t++);
     66 		if (!*m)
     67 			return (p - s1);
     68 	}
     69 	return (-1);
     70 }
     71 /*
     72  *  putback - push character back onto input
     73  */
     74 void
     75 putback(c)
     76 char c;
     77 {
     78 	if (bp < endpbb)
     79 		*bp++ = c;
     80 	else
     81 		oops("too many characters pushed back");
     82 }
     83 
     84 /*
     85  *  pbstr - push string back onto input
     86  *          putback is replicated to improve
     87  *          performance.
     88  */
     89 void
     90 pbstr(s)
     91 register char *s;
     92 {
     93 	register char *es;
     94 	register char *zp;
     95 
     96 	es = s;
     97 	zp = bp;
     98 
     99 	while (*es)
    100 		es++;
    101 	es--;
    102 	while (es >= s)
    103 		if (zp < endpbb)
    104 			*zp++ = *es--;
    105 	if ((bp = zp) == endpbb)
    106 		oops("too many characters pushed back");
    107 }
    108 
    109 /*
    110  *  pbnum - convert number to string, push back on input.
    111  */
    112 void
    113 pbnum(n)
    114 int n;
    115 {
    116 	register int num;
    117 
    118 	num = (n < 0) ? -n : n;
    119 	do {
    120 		putback(num % 10 + '0');
    121 	}
    122 	while ((num /= 10) > 0);
    123 
    124 	if (n < 0)
    125 		putback('-');
    126 }
    127 
    128 /*
    129  *  chrsave - put single char on string space
    130  */
    131 void
    132 chrsave(c)
    133 char c;
    134 {
    135 	if (ep < endest)
    136 		*ep++ = c;
    137 	else
    138 		oops("string space overflow");
    139 }
    140 
    141 /*
    142  * read in a diversion file, and dispose it.
    143  */
    144 void
    145 getdiv(n)
    146 int n;
    147 {
    148 	register int c;
    149 	register FILE *dfil;
    150 
    151 	if (active == outfile[n])
    152 		oops("%s: diversion still active.", "undivert");
    153 	(void) fclose(outfile[n]);
    154 	outfile[n] = NULL;
    155 	m4temp[UNIQUE] = n + '0';
    156 	if ((dfil = fopen(m4temp, "r")) == NULL)
    157 		oops("%s: cannot undivert.", m4temp);
    158 	else
    159 		while ((c = getc(dfil)) != EOF)
    160 			putc(c, active);
    161 	(void) fclose(dfil);
    162 
    163 #ifdef vms
    164 	if (remove(m4temp))
    165 #else
    166 	if (unlink(m4temp) == -1)
    167 #endif
    168 		oops("%s: cannot unlink.", m4temp);
    169 }
    170 
    171 void
    172 onintr(signo)
    173 	int signo;
    174 {
    175 	oops("interrupted.");
    176 }
    177 
    178 /*
    179  * killdiv - get rid of the diversion files
    180  */
    181 void
    182 killdiv()
    183 {
    184 	register int n;
    185 
    186 	for (n = 0; n < MAXOUT; n++)
    187 		if (outfile[n] != NULL) {
    188 			(void) fclose(outfile[n]);
    189 			m4temp[UNIQUE] = n + '0';
    190 #ifdef vms
    191 			(void) remove(m4temp);
    192 #else
    193 			(void) unlink(m4temp);
    194 #endif
    195 		}
    196 }
    197 
    198 char *
    199 xalloc(n)
    200 unsigned long n;
    201 {
    202 	register char *p = malloc(n);
    203 
    204 	if (p == NULL)
    205 		oops("malloc: %s", strerror(errno));
    206 	return p;
    207 }
    208 
    209 char *
    210 xstrdup(s)
    211 const char *s;
    212 {
    213 	register char *p = strdup(s);
    214 	if (p == NULL)
    215 		oops("strdup: %s", strerror(errno));
    216 	return p;
    217 }
    218 
    219 char *
    220 basename(s)
    221 register char *s;
    222 {
    223 	register char *p;
    224 	extern char *strrchr();
    225 
    226 	if ((p = strrchr(s, '/')) == NULL)
    227 		return s;
    228 
    229 	return ++p;
    230 }
    231 
    232 void
    233 usage()
    234 {
    235 	fprintf(stderr, "usage: m4 [-Dname[=val]] [-Uname]\n");
    236 	exit(1);
    237 }
    238 
    239 #if __STDC__
    240 #include <stdarg.h>
    241 #else
    242 #include <varargs.h>
    243 #endif
    244 
    245 void
    246 #if __STDC__
    247 oops(const char *fmt, ...)
    248 #else
    249 oops(fmt, va_alist)
    250 	char *fmt;
    251 	va_dcl
    252 #endif
    253 {
    254 	va_list ap;
    255 #if __STDC__
    256 	va_start(ap, fmt);
    257 #else
    258 	va_start(ap);
    259 #endif
    260 	(void)fprintf(stderr, "%s: ", progname);
    261 	(void)vfprintf(stderr, fmt, ap);
    262 	va_end(ap);
    263 	(void)fprintf(stderr, "\n");
    264 	exit(1);
    265 	/* NOTREACHED */
    266 }
    267