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1 | /* $Header: util.c,v 4.0 91/03/20 01:58:25 lwall Locked $ |
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2 | * |
3 | * Copyright (c) 1989, Larry Wall |
4 | * |
5 | * You may distribute under the terms of the GNU General Public License |
6 | * as specified in the README file that comes with the perl 3.0 kit. |
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7 | * |
8 | * $Log: util.c,v $ |
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9 | * Revision 4.0 91/03/20 01:58:25 lwall |
10 | * 4.0 baseline. |
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11 | * |
12 | */ |
13 | |
14 | #include <stdio.h> |
15 | |
16 | #include "handy.h" |
17 | #include "EXTERN.h" |
18 | #include "a2p.h" |
19 | #include "INTERN.h" |
20 | #include "util.h" |
21 | |
22 | #define FLUSH |
23 | #define MEM_SIZE unsigned int |
24 | |
25 | static char nomem[] = "Out of memory!\n"; |
26 | |
27 | /* paranoid version of malloc */ |
28 | |
29 | static int an = 0; |
30 | |
31 | char * |
32 | safemalloc(size) |
33 | MEM_SIZE size; |
34 | { |
35 | char *ptr; |
36 | char *malloc(); |
37 | |
38 | ptr = malloc(size?size:1); /* malloc(0) is NASTY on our system */ |
39 | #ifdef DEBUGGING |
40 | if (debug & 128) |
41 | fprintf(stderr,"0x%x: (%05d) malloc %d bytes\n",ptr,an++,size); |
42 | #endif |
43 | if (ptr != Nullch) |
44 | return ptr; |
45 | else { |
46 | fputs(nomem,stdout) FLUSH; |
47 | exit(1); |
48 | } |
49 | /*NOTREACHED*/ |
50 | } |
51 | |
52 | /* paranoid version of realloc */ |
53 | |
54 | char * |
55 | saferealloc(where,size) |
56 | char *where; |
57 | MEM_SIZE size; |
58 | { |
59 | char *ptr; |
60 | char *realloc(); |
61 | |
62 | ptr = realloc(where,size?size:1); /* realloc(0) is NASTY on our system */ |
63 | #ifdef DEBUGGING |
64 | if (debug & 128) { |
65 | fprintf(stderr,"0x%x: (%05d) rfree\n",where,an++); |
66 | fprintf(stderr,"0x%x: (%05d) realloc %d bytes\n",ptr,an++,size); |
67 | } |
68 | #endif |
69 | if (ptr != Nullch) |
70 | return ptr; |
71 | else { |
72 | fputs(nomem,stdout) FLUSH; |
73 | exit(1); |
74 | } |
75 | /*NOTREACHED*/ |
76 | } |
77 | |
78 | /* safe version of free */ |
79 | |
80 | safefree(where) |
81 | char *where; |
82 | { |
83 | #ifdef DEBUGGING |
84 | if (debug & 128) |
85 | fprintf(stderr,"0x%x: (%05d) free\n",where,an++); |
86 | #endif |
87 | free(where); |
88 | } |
89 | |
90 | /* safe version of string copy */ |
91 | |
92 | char * |
93 | safecpy(to,from,len) |
94 | char *to; |
95 | register char *from; |
96 | register int len; |
97 | { |
98 | register char *dest = to; |
99 | |
100 | if (from != Nullch) |
101 | for (len--; len && (*dest++ = *from++); len--) ; |
102 | *dest = '\0'; |
103 | return to; |
104 | } |
105 | |
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106 | /* copy a string up to some (non-backslashed) delimiter, if any */ |
107 | |
108 | char * |
109 | cpytill(to,from,delim) |
110 | register char *to, *from; |
111 | register int delim; |
112 | { |
113 | for (; *from; from++,to++) { |
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114 | if (*from == '\\') { |
115 | if (from[1] == delim) |
116 | from++; |
117 | else if (from[1] == '\\') |
118 | *to++ = *from++; |
119 | } |
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120 | else if (*from == delim) |
121 | break; |
122 | *to = *from; |
123 | } |
124 | *to = '\0'; |
125 | return from; |
126 | } |
127 | |
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128 | |
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129 | char * |
130 | cpy2(to,from,delim) |
131 | register char *to, *from; |
132 | register int delim; |
133 | { |
134 | for (; *from; from++,to++) { |
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135 | if (*from == '\\') |
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136 | *to++ = *from++; |
137 | else if (*from == '$') |
138 | *to++ = '\\'; |
139 | else if (*from == delim) |
140 | break; |
141 | *to = *from; |
142 | } |
143 | *to = '\0'; |
144 | return from; |
145 | } |
146 | |
147 | /* return ptr to little string in big string, NULL if not found */ |
148 | |
149 | char * |
150 | instr(big, little) |
151 | char *big, *little; |
152 | |
153 | { |
154 | register char *t, *s, *x; |
155 | |
156 | for (t = big; *t; t++) { |
157 | for (x=t,s=little; *s; x++,s++) { |
158 | if (!*x) |
159 | return Nullch; |
160 | if (*s != *x) |
161 | break; |
162 | } |
163 | if (!*s) |
164 | return t; |
165 | } |
166 | return Nullch; |
167 | } |
168 | |
169 | /* copy a string to a safe spot */ |
170 | |
171 | char * |
172 | savestr(str) |
173 | char *str; |
174 | { |
175 | register char *newaddr = safemalloc((MEM_SIZE)(strlen(str)+1)); |
176 | |
177 | (void)strcpy(newaddr,str); |
178 | return newaddr; |
179 | } |
180 | |
181 | /* grow a static string to at least a certain length */ |
182 | |
183 | void |
184 | growstr(strptr,curlen,newlen) |
185 | char **strptr; |
186 | int *curlen; |
187 | int newlen; |
188 | { |
189 | if (newlen > *curlen) { /* need more room? */ |
190 | if (*curlen) |
191 | *strptr = saferealloc(*strptr,(MEM_SIZE)newlen); |
192 | else |
193 | *strptr = safemalloc((MEM_SIZE)newlen); |
194 | *curlen = newlen; |
195 | } |
196 | } |
197 | |
198 | /*VARARGS1*/ |
199 | fatal(pat,a1,a2,a3,a4) |
200 | char *pat; |
201 | { |
202 | fprintf(stderr,pat,a1,a2,a3,a4); |
203 | exit(1); |
204 | } |
205 | |
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206 | /*VARARGS1*/ |
207 | warn(pat,a1,a2,a3,a4) |
208 | char *pat; |
209 | { |
210 | fprintf(stderr,pat,a1,a2,a3,a4); |
211 | } |
212 | |
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213 | static bool firstsetenv = TRUE; |
214 | extern char **environ; |
215 | |
216 | void |
217 | setenv(nam,val) |
218 | char *nam, *val; |
219 | { |
220 | register int i=envix(nam); /* where does it go? */ |
221 | |
222 | if (!environ[i]) { /* does not exist yet */ |
223 | if (firstsetenv) { /* need we copy environment? */ |
224 | int j; |
225 | #ifndef lint |
226 | char **tmpenv = (char**) /* point our wand at memory */ |
227 | safemalloc((i+2) * sizeof(char*)); |
228 | #else |
229 | char **tmpenv = Null(char **); |
230 | #endif /* lint */ |
231 | |
232 | firstsetenv = FALSE; |
233 | for (j=0; j<i; j++) /* copy environment */ |
234 | tmpenv[j] = environ[j]; |
235 | environ = tmpenv; /* tell exec where it is now */ |
236 | } |
237 | #ifndef lint |
238 | else |
239 | environ = (char**) saferealloc((char*) environ, |
240 | (i+2) * sizeof(char*)); |
241 | /* just expand it a bit */ |
242 | #endif /* lint */ |
243 | environ[i+1] = Nullch; /* make sure it's null terminated */ |
244 | } |
245 | environ[i] = safemalloc(strlen(nam) + strlen(val) + 2); |
246 | /* this may or may not be in */ |
247 | /* the old environ structure */ |
248 | sprintf(environ[i],"%s=%s",nam,val);/* all that work just for this */ |
249 | } |
250 | |
251 | int |
252 | envix(nam) |
253 | char *nam; |
254 | { |
255 | register int i, len = strlen(nam); |
256 | |
257 | for (i = 0; environ[i]; i++) { |
258 | if (strnEQ(environ[i],nam,len) && environ[i][len] == '=') |
259 | break; /* strnEQ must come first to avoid */ |
260 | } /* potential SEGV's */ |
261 | return i; |
262 | } |