summaryrefslogtreecommitdiff
path: root/x2p/util.c
blob: a7fdaea35dff760d3c29140a32f51ba6320f6505 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
/* $RCSfile: util.c,v $$Revision: 4.1 $$Date: 92/08/07 18:29:29 $
 *
 *    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:	util.c,v $
 */

#include "EXTERN.h"
#include "a2p.h"
#include "INTERN.h"
#include "util.h"

#define FLUSH

static char nomem[] = "Out of memory!\n";

/* paranoid version of malloc */


Malloc_t
safemalloc(size)
MEM_SIZE size;
{
    char *ptr;
    Malloc_t malloc();

    ptr = (char *) malloc(size?size:1);	/* malloc(0) is NASTY on our system */
#ifdef DEBUGGING
    if (debug & 128)
	fprintf(stderr,"0x%x: (%05d) malloc %d bytes\n",ptr,an++,size);
#endif
    if (ptr != Nullch)
	return ptr;
    else {
	fputs(nomem,stdout) FLUSH;
	exit(1);
    }
    /*NOTREACHED*/
}

/* paranoid version of realloc */

Malloc_t
saferealloc(where,size)
char *where;
MEM_SIZE size;
{
    char *ptr;
    Malloc_t realloc();

    ptr = (char *)
		realloc(where,size?size:1);	/* realloc(0) is NASTY on our system */
#ifdef DEBUGGING
    if (debug & 128) {
	fprintf(stderr,"0x%x: (%05d) rfree\n",where,an++);
	fprintf(stderr,"0x%x: (%05d) realloc %d bytes\n",ptr,an++,size);
    }
#endif
    if (ptr != Nullch)
	return ptr;
    else {
	fputs(nomem,stdout) FLUSH;
	exit(1);
    }
    /*NOTREACHED*/
}

/* safe version of free */

void
safefree(where)
char *where;
{
#ifdef DEBUGGING
    if (debug & 128)
	fprintf(stderr,"0x%x: (%05d) free\n",where,an++);
#endif
    free(where);
}

/* safe version of string copy */

char *
safecpy(to,from,len)
char *to;
register char *from;
register int len;
{
    register char *dest = to;

    if (from != Nullch) 
	for (len--; len && (*dest++ = *from++); len--) ;
    *dest = '\0';
    return to;
}

/* copy a string up to some (non-backslashed) delimiter, if any */

char *
cpytill(to,from,delim)
register char *to, *from;
register int delim;
{
    for (; *from; from++,to++) {
	if (*from == '\\') {
	    if (from[1] == delim)
		from++;
	    else if (from[1] == '\\')
		*to++ = *from++;
	}
	else if (*from == delim)
	    break;
	*to = *from;
    }
    *to = '\0';
    return from;
}


char *
cpy2(to,from,delim)
register char *to, *from;
register int delim;
{
    for (; *from; from++,to++) {
	if (*from == '\\')
	    *to++ = *from++;
	else if (*from == '$')
	    *to++ = '\\';
	else if (*from == delim)
	    break;
	*to = *from;
    }
    *to = '\0';
    return from;
}

/* return ptr to little string in big string, NULL if not found */

char *
instr(big, little)
char *big, *little;

{
    register char *t, *s, *x;

    for (t = big; *t; t++) {
	for (x=t,s=little; *s; x++,s++) {
	    if (!*x)
		return Nullch;
	    if (*s != *x)
		break;
	}
	if (!*s)
	    return t;
    }
    return Nullch;
}

/* copy a string to a safe spot */

char *
savestr(str)
char *str;
{
    register char *newaddr = safemalloc((MEM_SIZE)(strlen(str)+1));

    (void)strcpy(newaddr,str);
    return newaddr;
}

/* grow a static string to at least a certain length */

void
growstr(strptr,curlen,newlen)
char **strptr;
int *curlen;
int newlen;
{
    if (newlen > *curlen) {		/* need more room? */
	if (*curlen)
	    *strptr = saferealloc(*strptr,(MEM_SIZE)newlen);
	else
	    *strptr = safemalloc((MEM_SIZE)newlen);
	*curlen = newlen;
    }
}

/*VARARGS1*/
int
croak(pat,a1,a2,a3,a4)
char *pat;
int a1,a2,a3,a4;
{
    fprintf(stderr,pat,a1,a2,a3,a4);
    exit(1);
}

/*VARARGS1*/
int
fatal(pat,a1,a2,a3,a4)
char *pat;
int a1,a2,a3,a4;
{
    fprintf(stderr,pat,a1,a2,a3,a4);
    exit(1);
}

/*VARARGS1*/
void
warn(pat,a1,a2,a3,a4)
char *pat;
int a1,a2,a3,a4;
{
    fprintf(stderr,pat,a1,a2,a3,a4);
}

static bool firstsetenv = TRUE;
extern char **environ;

void
setenv(nam,val)
char *nam, *val;
{
    register int i=envix(nam);		/* where does it go? */

    if (!environ[i]) {			/* does not exist yet */
	if (firstsetenv) {		/* need we copy environment? */
	    int j;
#ifndef lint
	    char **tmpenv = (char**)	/* point our wand at memory */
		safemalloc((i+2) * sizeof(char*));
#else
	    char **tmpenv = Null(char **);
#endif /* lint */
    
	    firstsetenv = FALSE;
	    for (j=0; j<i; j++)		/* copy environment */
		tmpenv[j] = environ[j];
	    environ = tmpenv;		/* tell exec where it is now */
	}
#ifndef lint
	else
	    environ = (char**) saferealloc((char*) environ,
		(i+2) * sizeof(char*));
					/* just expand it a bit */
#endif /* lint */
	environ[i+1] = Nullch;	/* make sure it's null terminated */
    }
    environ[i] = safemalloc(strlen(nam) + strlen(val) + 2);
					/* this may or may not be in */
					/* the old environ structure */
    sprintf(environ[i],"%s=%s",nam,val);/* all that work just for this */
}

int
envix(nam)
char *nam;
{
    register int i, len = strlen(nam);

    for (i = 0; environ[i]; i++) {
	if (strnEQ(environ[i],nam,len) && environ[i][len] == '=')
	    break;			/* strnEQ must come first to avoid */
    }					/* potential SEGV's */
    return i;
}