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8d063cd8 |
1 | /* $Header: util.c,v 1.0 87/12/18 13:06:30 root Exp $ |
2 | * |
3 | * $Log: util.c,v $ |
4 | * Revision 1.0 87/12/18 13:06:30 root |
5 | * Initial revision |
6 | * |
7 | */ |
8 | |
9 | #include <stdio.h> |
10 | |
11 | #include "handy.h" |
12 | #include "EXTERN.h" |
13 | #include "search.h" |
14 | #include "perl.h" |
15 | #include "INTERN.h" |
16 | #include "util.h" |
17 | |
18 | #define FLUSH |
19 | #define MEM_SIZE unsigned int |
20 | |
21 | static char nomem[] = "Out of memory!\n"; |
22 | |
23 | /* paranoid version of malloc */ |
24 | |
25 | static int an = 0; |
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 | |
102 | #ifdef undef |
103 | /* safe version of string concatenate, with \n deletion and space padding */ |
104 | |
105 | char * |
106 | safecat(to,from,len) |
107 | char *to; |
108 | register char *from; |
109 | register int len; |
110 | { |
111 | register char *dest = to; |
112 | |
113 | len--; /* leave room for null */ |
114 | if (*dest) { |
115 | while (len && *dest++) len--; |
116 | if (len) { |
117 | len--; |
118 | *(dest-1) = ' '; |
119 | } |
120 | } |
121 | if (from != Nullch) |
122 | while (len && (*dest++ = *from++)) len--; |
123 | if (len) |
124 | dest--; |
125 | if (*(dest-1) == '\n') |
126 | dest--; |
127 | *dest = '\0'; |
128 | return to; |
129 | } |
130 | #endif |
131 | |
132 | /* copy a string up to some (non-backslashed) delimiter, if any */ |
133 | |
134 | char * |
135 | cpytill(to,from,delim) |
136 | register char *to, *from; |
137 | register int delim; |
138 | { |
139 | for (; *from; from++,to++) { |
140 | if (*from == '\\' && from[1] == delim) |
141 | from++; |
142 | else if (*from == delim) |
143 | break; |
144 | *to = *from; |
145 | } |
146 | *to = '\0'; |
147 | return from; |
148 | } |
149 | |
150 | /* return ptr to little string in big string, NULL if not found */ |
151 | |
152 | char * |
153 | instr(big, little) |
154 | char *big, *little; |
155 | |
156 | { |
157 | register char *t, *s, *x; |
158 | |
159 | for (t = big; *t; t++) { |
160 | for (x=t,s=little; *s; x++,s++) { |
161 | if (!*x) |
162 | return Nullch; |
163 | if (*s != *x) |
164 | break; |
165 | } |
166 | if (!*s) |
167 | return t; |
168 | } |
169 | return Nullch; |
170 | } |
171 | |
172 | /* copy a string to a safe spot */ |
173 | |
174 | char * |
175 | savestr(str) |
176 | char *str; |
177 | { |
178 | register char *newaddr = safemalloc((MEM_SIZE)(strlen(str)+1)); |
179 | |
180 | (void)strcpy(newaddr,str); |
181 | return newaddr; |
182 | } |
183 | |
184 | /* grow a static string to at least a certain length */ |
185 | |
186 | void |
187 | growstr(strptr,curlen,newlen) |
188 | char **strptr; |
189 | int *curlen; |
190 | int newlen; |
191 | { |
192 | if (newlen > *curlen) { /* need more room? */ |
193 | if (*curlen) |
194 | *strptr = saferealloc(*strptr,(MEM_SIZE)newlen); |
195 | else |
196 | *strptr = safemalloc((MEM_SIZE)newlen); |
197 | *curlen = newlen; |
198 | } |
199 | } |
200 | |
201 | /*VARARGS1*/ |
202 | fatal(pat,a1,a2,a3,a4) |
203 | char *pat; |
204 | { |
205 | extern FILE *e_fp; |
206 | extern char *e_tmpname; |
207 | |
208 | fprintf(stderr,pat,a1,a2,a3,a4); |
209 | if (e_fp) |
210 | UNLINK(e_tmpname); |
211 | exit(1); |
212 | } |
213 | |
214 | static bool firstsetenv = TRUE; |
215 | extern char **environ; |
216 | |
217 | void |
218 | setenv(nam,val) |
219 | char *nam, *val; |
220 | { |
221 | register int i=envix(nam); /* where does it go? */ |
222 | |
223 | if (!environ[i]) { /* does not exist yet */ |
224 | if (firstsetenv) { /* need we copy environment? */ |
225 | int j; |
226 | #ifndef lint |
227 | char **tmpenv = (char**) /* point our wand at memory */ |
228 | safemalloc((i+2) * sizeof(char*)); |
229 | #else |
230 | char **tmpenv = Null(char **); |
231 | #endif /* lint */ |
232 | |
233 | firstsetenv = FALSE; |
234 | for (j=0; j<i; j++) /* copy environment */ |
235 | tmpenv[j] = environ[j]; |
236 | environ = tmpenv; /* tell exec where it is now */ |
237 | } |
238 | #ifndef lint |
239 | else |
240 | environ = (char**) saferealloc((char*) environ, |
241 | (i+2) * sizeof(char*)); |
242 | /* just expand it a bit */ |
243 | #endif /* lint */ |
244 | environ[i+1] = Nullch; /* make sure it's null terminated */ |
245 | } |
246 | environ[i] = safemalloc(strlen(nam) + strlen(val) + 2); |
247 | /* this may or may not be in */ |
248 | /* the old environ structure */ |
249 | sprintf(environ[i],"%s=%s",nam,val);/* all that work just for this */ |
250 | } |
251 | |
252 | int |
253 | envix(nam) |
254 | char *nam; |
255 | { |
256 | register int i, len = strlen(nam); |
257 | |
258 | for (i = 0; environ[i]; i++) { |
259 | if (strnEQ(environ[i],nam,len) && environ[i][len] == '=') |
260 | break; /* strnEQ must come first to avoid */ |
261 | } /* potential SEGV's */ |
262 | return i; |
263 | } |