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1 | /* $RCSfile: util.c,v $$Revision: 4.1 $$Date: 92/08/07 18:29:29 $ |
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2 | * |
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3 | * Copyright (c) 1991, Larry Wall |
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4 | * |
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5 | * You may distribute under the terms of either the GNU General Public |
6 | * License or the Artistic License, as specified in the README file. |
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7 | * |
8 | * $Log: util.c,v $ |
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9 | */ |
10 | |
11 | #include <stdio.h> |
12 | |
13 | #include "handy.h" |
14 | #include "EXTERN.h" |
15 | #include "a2p.h" |
16 | #include "INTERN.h" |
17 | #include "util.h" |
18 | |
19 | #define FLUSH |
20 | #define MEM_SIZE unsigned int |
21 | |
22 | static char nomem[] = "Out of memory!\n"; |
23 | |
24 | /* paranoid version of malloc */ |
25 | |
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26 | |
27 | char * |
28 | safemalloc(size) |
29 | MEM_SIZE size; |
30 | { |
31 | char *ptr; |
32 | char *malloc(); |
33 | |
34 | ptr = malloc(size?size:1); /* malloc(0) is NASTY on our system */ |
35 | #ifdef DEBUGGING |
36 | if (debug & 128) |
37 | fprintf(stderr,"0x%x: (%05d) malloc %d bytes\n",ptr,an++,size); |
38 | #endif |
39 | if (ptr != Nullch) |
40 | return ptr; |
41 | else { |
42 | fputs(nomem,stdout) FLUSH; |
43 | exit(1); |
44 | } |
45 | /*NOTREACHED*/ |
46 | } |
47 | |
48 | /* paranoid version of realloc */ |
49 | |
50 | char * |
51 | saferealloc(where,size) |
52 | char *where; |
53 | MEM_SIZE size; |
54 | { |
55 | char *ptr; |
56 | char *realloc(); |
57 | |
58 | ptr = realloc(where,size?size:1); /* realloc(0) is NASTY on our system */ |
59 | #ifdef DEBUGGING |
60 | if (debug & 128) { |
61 | fprintf(stderr,"0x%x: (%05d) rfree\n",where,an++); |
62 | fprintf(stderr,"0x%x: (%05d) realloc %d bytes\n",ptr,an++,size); |
63 | } |
64 | #endif |
65 | if (ptr != Nullch) |
66 | return ptr; |
67 | else { |
68 | fputs(nomem,stdout) FLUSH; |
69 | exit(1); |
70 | } |
71 | /*NOTREACHED*/ |
72 | } |
73 | |
74 | /* safe version of free */ |
75 | |
76 | safefree(where) |
77 | char *where; |
78 | { |
79 | #ifdef DEBUGGING |
80 | if (debug & 128) |
81 | fprintf(stderr,"0x%x: (%05d) free\n",where,an++); |
82 | #endif |
83 | free(where); |
84 | } |
85 | |
86 | /* safe version of string copy */ |
87 | |
88 | char * |
89 | safecpy(to,from,len) |
90 | char *to; |
91 | register char *from; |
92 | register int len; |
93 | { |
94 | register char *dest = to; |
95 | |
96 | if (from != Nullch) |
97 | for (len--; len && (*dest++ = *from++); len--) ; |
98 | *dest = '\0'; |
99 | return to; |
100 | } |
101 | |
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102 | /* copy a string up to some (non-backslashed) delimiter, if any */ |
103 | |
104 | char * |
105 | cpytill(to,from,delim) |
106 | register char *to, *from; |
107 | register int delim; |
108 | { |
109 | for (; *from; from++,to++) { |
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110 | if (*from == '\\') { |
111 | if (from[1] == delim) |
112 | from++; |
113 | else if (from[1] == '\\') |
114 | *to++ = *from++; |
115 | } |
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116 | else if (*from == delim) |
117 | break; |
118 | *to = *from; |
119 | } |
120 | *to = '\0'; |
121 | return from; |
122 | } |
123 | |
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124 | |
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125 | char * |
126 | cpy2(to,from,delim) |
127 | register char *to, *from; |
128 | register int delim; |
129 | { |
130 | for (; *from; from++,to++) { |
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131 | if (*from == '\\') |
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132 | *to++ = *from++; |
133 | else if (*from == '$') |
134 | *to++ = '\\'; |
135 | else if (*from == delim) |
136 | break; |
137 | *to = *from; |
138 | } |
139 | *to = '\0'; |
140 | return from; |
141 | } |
142 | |
143 | /* return ptr to little string in big string, NULL if not found */ |
144 | |
145 | char * |
146 | instr(big, little) |
147 | char *big, *little; |
148 | |
149 | { |
150 | register char *t, *s, *x; |
151 | |
152 | for (t = big; *t; t++) { |
153 | for (x=t,s=little; *s; x++,s++) { |
154 | if (!*x) |
155 | return Nullch; |
156 | if (*s != *x) |
157 | break; |
158 | } |
159 | if (!*s) |
160 | return t; |
161 | } |
162 | return Nullch; |
163 | } |
164 | |
165 | /* copy a string to a safe spot */ |
166 | |
167 | char * |
168 | savestr(str) |
169 | char *str; |
170 | { |
171 | register char *newaddr = safemalloc((MEM_SIZE)(strlen(str)+1)); |
172 | |
173 | (void)strcpy(newaddr,str); |
174 | return newaddr; |
175 | } |
176 | |
177 | /* grow a static string to at least a certain length */ |
178 | |
179 | void |
180 | growstr(strptr,curlen,newlen) |
181 | char **strptr; |
182 | int *curlen; |
183 | int newlen; |
184 | { |
185 | if (newlen > *curlen) { /* need more room? */ |
186 | if (*curlen) |
187 | *strptr = saferealloc(*strptr,(MEM_SIZE)newlen); |
188 | else |
189 | *strptr = safemalloc((MEM_SIZE)newlen); |
190 | *curlen = newlen; |
191 | } |
192 | } |
193 | |
194 | /*VARARGS1*/ |
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195 | croak(pat,a1,a2,a3,a4) |
196 | char *pat; |
197 | { |
198 | fprintf(stderr,pat,a1,a2,a3,a4); |
199 | exit(1); |
200 | } |
201 | |
202 | /*VARARGS1*/ |
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203 | fatal(pat,a1,a2,a3,a4) |
204 | char *pat; |
205 | { |
206 | fprintf(stderr,pat,a1,a2,a3,a4); |
207 | exit(1); |
208 | } |
209 | |
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210 | /*VARARGS1*/ |
211 | warn(pat,a1,a2,a3,a4) |
212 | char *pat; |
213 | { |
214 | fprintf(stderr,pat,a1,a2,a3,a4); |
215 | } |
216 | |
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217 | static bool firstsetenv = TRUE; |
218 | extern char **environ; |
219 | |
220 | void |
221 | setenv(nam,val) |
222 | char *nam, *val; |
223 | { |
224 | register int i=envix(nam); /* where does it go? */ |
225 | |
226 | if (!environ[i]) { /* does not exist yet */ |
227 | if (firstsetenv) { /* need we copy environment? */ |
228 | int j; |
229 | #ifndef lint |
230 | char **tmpenv = (char**) /* point our wand at memory */ |
231 | safemalloc((i+2) * sizeof(char*)); |
232 | #else |
233 | char **tmpenv = Null(char **); |
234 | #endif /* lint */ |
235 | |
236 | firstsetenv = FALSE; |
237 | for (j=0; j<i; j++) /* copy environment */ |
238 | tmpenv[j] = environ[j]; |
239 | environ = tmpenv; /* tell exec where it is now */ |
240 | } |
241 | #ifndef lint |
242 | else |
243 | environ = (char**) saferealloc((char*) environ, |
244 | (i+2) * sizeof(char*)); |
245 | /* just expand it a bit */ |
246 | #endif /* lint */ |
247 | environ[i+1] = Nullch; /* make sure it's null terminated */ |
248 | } |
249 | environ[i] = safemalloc(strlen(nam) + strlen(val) + 2); |
250 | /* this may or may not be in */ |
251 | /* the old environ structure */ |
252 | sprintf(environ[i],"%s=%s",nam,val);/* all that work just for this */ |
253 | } |
254 | |
255 | int |
256 | envix(nam) |
257 | char *nam; |
258 | { |
259 | register int i, len = strlen(nam); |
260 | |
261 | for (i = 0; environ[i]; i++) { |
262 | if (strnEQ(environ[i],nam,len) && environ[i][len] == '=') |
263 | break; /* strnEQ must come first to avoid */ |
264 | } /* potential SEGV's */ |
265 | return i; |
266 | } |