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8d063cd8 |
1 | /* $Header: util.c,v 1.0 87/12/18 13:07:34 root Exp $ |
2 | * |
3 | * $Log: util.c,v $ |
4 | * Revision 1.0 87/12/18 13:07:34 root |
5 | * Initial revision |
6 | * |
7 | */ |
8 | |
9 | #include <stdio.h> |
10 | |
11 | #include "handy.h" |
12 | #include "EXTERN.h" |
13 | #include "a2p.h" |
14 | #include "INTERN.h" |
15 | #include "util.h" |
16 | |
17 | #define FLUSH |
18 | #define MEM_SIZE unsigned int |
19 | |
20 | static char nomem[] = "Out of memory!\n"; |
21 | |
22 | /* paranoid version of malloc */ |
23 | |
24 | static int an = 0; |
25 | |
26 | char * |
27 | safemalloc(size) |
28 | MEM_SIZE size; |
29 | { |
30 | char *ptr; |
31 | char *malloc(); |
32 | |
33 | ptr = malloc(size?size:1); /* malloc(0) is NASTY on our system */ |
34 | #ifdef DEBUGGING |
35 | if (debug & 128) |
36 | fprintf(stderr,"0x%x: (%05d) malloc %d bytes\n",ptr,an++,size); |
37 | #endif |
38 | if (ptr != Nullch) |
39 | return ptr; |
40 | else { |
41 | fputs(nomem,stdout) FLUSH; |
42 | exit(1); |
43 | } |
44 | /*NOTREACHED*/ |
45 | } |
46 | |
47 | /* paranoid version of realloc */ |
48 | |
49 | char * |
50 | saferealloc(where,size) |
51 | char *where; |
52 | MEM_SIZE size; |
53 | { |
54 | char *ptr; |
55 | char *realloc(); |
56 | |
57 | ptr = realloc(where,size?size:1); /* realloc(0) is NASTY on our system */ |
58 | #ifdef DEBUGGING |
59 | if (debug & 128) { |
60 | fprintf(stderr,"0x%x: (%05d) rfree\n",where,an++); |
61 | fprintf(stderr,"0x%x: (%05d) realloc %d bytes\n",ptr,an++,size); |
62 | } |
63 | #endif |
64 | if (ptr != Nullch) |
65 | return ptr; |
66 | else { |
67 | fputs(nomem,stdout) FLUSH; |
68 | exit(1); |
69 | } |
70 | /*NOTREACHED*/ |
71 | } |
72 | |
73 | /* safe version of free */ |
74 | |
75 | safefree(where) |
76 | char *where; |
77 | { |
78 | #ifdef DEBUGGING |
79 | if (debug & 128) |
80 | fprintf(stderr,"0x%x: (%05d) free\n",where,an++); |
81 | #endif |
82 | free(where); |
83 | } |
84 | |
85 | /* safe version of string copy */ |
86 | |
87 | char * |
88 | safecpy(to,from,len) |
89 | char *to; |
90 | register char *from; |
91 | register int len; |
92 | { |
93 | register char *dest = to; |
94 | |
95 | if (from != Nullch) |
96 | for (len--; len && (*dest++ = *from++); len--) ; |
97 | *dest = '\0'; |
98 | return to; |
99 | } |
100 | |
101 | #ifdef undef |
102 | /* safe version of string concatenate, with \n deletion and space padding */ |
103 | |
104 | char * |
105 | safecat(to,from,len) |
106 | char *to; |
107 | register char *from; |
108 | register int len; |
109 | { |
110 | register char *dest = to; |
111 | |
112 | len--; /* leave room for null */ |
113 | if (*dest) { |
114 | while (len && *dest++) len--; |
115 | if (len) { |
116 | len--; |
117 | *(dest-1) = ' '; |
118 | } |
119 | } |
120 | if (from != Nullch) |
121 | while (len && (*dest++ = *from++)) len--; |
122 | if (len) |
123 | dest--; |
124 | if (*(dest-1) == '\n') |
125 | dest--; |
126 | *dest = '\0'; |
127 | return to; |
128 | } |
129 | #endif |
130 | |
131 | /* copy a string up to some (non-backslashed) delimiter, if any */ |
132 | |
133 | char * |
134 | cpytill(to,from,delim) |
135 | register char *to, *from; |
136 | register int delim; |
137 | { |
138 | for (; *from; from++,to++) { |
139 | if (*from == '\\' && from[1] == delim) |
140 | *to++ = *from++; |
141 | else if (*from == delim) |
142 | break; |
143 | *to = *from; |
144 | } |
145 | *to = '\0'; |
146 | return from; |
147 | } |
148 | |
149 | char * |
150 | cpy2(to,from,delim) |
151 | register char *to, *from; |
152 | register int delim; |
153 | { |
154 | for (; *from; from++,to++) { |
155 | if (*from == '\\' && from[1] == delim) |
156 | *to++ = *from++; |
157 | else if (*from == '$') |
158 | *to++ = '\\'; |
159 | else if (*from == delim) |
160 | break; |
161 | *to = *from; |
162 | } |
163 | *to = '\0'; |
164 | return from; |
165 | } |
166 | |
167 | /* return ptr to little string in big string, NULL if not found */ |
168 | |
169 | char * |
170 | instr(big, little) |
171 | char *big, *little; |
172 | |
173 | { |
174 | register char *t, *s, *x; |
175 | |
176 | for (t = big; *t; t++) { |
177 | for (x=t,s=little; *s; x++,s++) { |
178 | if (!*x) |
179 | return Nullch; |
180 | if (*s != *x) |
181 | break; |
182 | } |
183 | if (!*s) |
184 | return t; |
185 | } |
186 | return Nullch; |
187 | } |
188 | |
189 | /* copy a string to a safe spot */ |
190 | |
191 | char * |
192 | savestr(str) |
193 | char *str; |
194 | { |
195 | register char *newaddr = safemalloc((MEM_SIZE)(strlen(str)+1)); |
196 | |
197 | (void)strcpy(newaddr,str); |
198 | return newaddr; |
199 | } |
200 | |
201 | /* grow a static string to at least a certain length */ |
202 | |
203 | void |
204 | growstr(strptr,curlen,newlen) |
205 | char **strptr; |
206 | int *curlen; |
207 | int newlen; |
208 | { |
209 | if (newlen > *curlen) { /* need more room? */ |
210 | if (*curlen) |
211 | *strptr = saferealloc(*strptr,(MEM_SIZE)newlen); |
212 | else |
213 | *strptr = safemalloc((MEM_SIZE)newlen); |
214 | *curlen = newlen; |
215 | } |
216 | } |
217 | |
218 | /*VARARGS1*/ |
219 | fatal(pat,a1,a2,a3,a4) |
220 | char *pat; |
221 | { |
222 | fprintf(stderr,pat,a1,a2,a3,a4); |
223 | exit(1); |
224 | } |
225 | |
226 | static bool firstsetenv = TRUE; |
227 | extern char **environ; |
228 | |
229 | void |
230 | setenv(nam,val) |
231 | char *nam, *val; |
232 | { |
233 | register int i=envix(nam); /* where does it go? */ |
234 | |
235 | if (!environ[i]) { /* does not exist yet */ |
236 | if (firstsetenv) { /* need we copy environment? */ |
237 | int j; |
238 | #ifndef lint |
239 | char **tmpenv = (char**) /* point our wand at memory */ |
240 | safemalloc((i+2) * sizeof(char*)); |
241 | #else |
242 | char **tmpenv = Null(char **); |
243 | #endif /* lint */ |
244 | |
245 | firstsetenv = FALSE; |
246 | for (j=0; j<i; j++) /* copy environment */ |
247 | tmpenv[j] = environ[j]; |
248 | environ = tmpenv; /* tell exec where it is now */ |
249 | } |
250 | #ifndef lint |
251 | else |
252 | environ = (char**) saferealloc((char*) environ, |
253 | (i+2) * sizeof(char*)); |
254 | /* just expand it a bit */ |
255 | #endif /* lint */ |
256 | environ[i+1] = Nullch; /* make sure it's null terminated */ |
257 | } |
258 | environ[i] = safemalloc(strlen(nam) + strlen(val) + 2); |
259 | /* this may or may not be in */ |
260 | /* the old environ structure */ |
261 | sprintf(environ[i],"%s=%s",nam,val);/* all that work just for this */ |
262 | } |
263 | |
264 | int |
265 | envix(nam) |
266 | char *nam; |
267 | { |
268 | register int i, len = strlen(nam); |
269 | |
270 | for (i = 0; environ[i]; i++) { |
271 | if (strnEQ(environ[i],nam,len) && environ[i][len] == '=') |
272 | break; /* strnEQ must come first to avoid */ |
273 | } /* potential SEGV's */ |
274 | return i; |
275 | } |