Annotation of src/usr.bin/sudo/alloc.c, Revision 1.12
1.1 millert 1: /*
1.11 millert 2: * Copyright (c) 1999-2005, 2007
3: * Todd C. Miller <Todd.Miller@courtesan.com>
1.1 millert 4: *
1.8 millert 5: * Permission to use, copy, modify, and distribute this software for any
6: * purpose with or without fee is hereby granted, provided that the above
7: * copyright notice and this permission notice appear in all copies.
8: *
9: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
1.7 millert 16: *
17: * Sponsored in part by the Defense Advanced Research Projects
18: * Agency (DARPA) and Air Force Research Laboratory, Air Force
19: * Materiel Command, USAF, under agreement number F39502-99-1-0512.
1.1 millert 20: */
21:
1.9 millert 22: #include <config.h>
1.1 millert 23:
1.3 millert 24: #include <sys/types.h>
25: #include <sys/param.h>
1.1 millert 26: #include <stdio.h>
27: #ifdef STDC_HEADERS
1.3 millert 28: # include <stdlib.h>
29: # include <stddef.h>
30: #else
31: # ifdef HAVE_STDLIB_H
32: # include <stdlib.h>
33: # endif
1.1 millert 34: #endif /* STDC_HEADERS */
35: #ifdef HAVE_STRING_H
1.3 millert 36: # include <string.h>
37: #else
38: # ifdef HAVE_STRINGS_H
39: # include <strings.h>
40: # endif
1.1 millert 41: #endif /* HAVE_STRING_H */
42: #if defined(HAVE_MALLOC_H) && !defined(STDC_HEADERS)
1.3 millert 43: # include <malloc.h>
1.1 millert 44: #endif /* HAVE_MALLOC_H && !STDC_HEADERS */
1.10 millert 45: #ifdef HAVE_INTTYPES_H
46: # include <inttypes.h>
47: #endif
1.1 millert 48:
49: #include "sudo.h"
50:
1.5 millert 51: /*
52: * If there is no SIZE_MAX or SIZE_T_MAX we have to assume that size_t
53: * could be signed (as it is on SunOS 4.x). This just means that
54: * emalloc2() and erealloc3() cannot allocate huge amounts on such a
55: * platform but that is OK since sudo doesn't need to do so anyway.
56: */
57: #ifndef SIZE_MAX
58: # ifdef SIZE_T_MAX
59: # define SIZE_MAX SIZE_T_MAX
60: # else
1.8 millert 61: # define SIZE_MAX INT_MAX
1.5 millert 62: # endif /* SIZE_T_MAX */
63: #endif /* SIZE_MAX */
64:
1.1 millert 65: /*
66: * emalloc() calls the system malloc(3) and exits with an error if
67: * malloc(3) fails.
68: */
1.11 millert 69: void *
1.1 millert 70: emalloc(size)
71: size_t size;
72: {
1.11 millert 73: void *ptr;
1.1 millert 74:
1.6 millert 75: if (size == 0)
1.11 millert 76: errorx(1, "internal error, tried to emalloc(0)");
1.6 millert 77:
1.11 millert 78: if ((ptr = malloc(size)) == NULL)
79: errorx(1, "unable to allocate memory");
1.5 millert 80: return(ptr);
81: }
82:
83: /*
84: * emalloc2() allocates nmemb * size bytes and exits with an error
85: * if overflow would occur or if the system malloc(3) fails.
86: */
1.11 millert 87: void *
1.5 millert 88: emalloc2(nmemb, size)
89: size_t nmemb;
90: size_t size;
91: {
1.11 millert 92: void *ptr;
1.5 millert 93:
1.6 millert 94: if (nmemb == 0 || size == 0)
1.11 millert 95: errorx(1, "internal error, tried to emalloc2(0)");
1.6 millert 96: if (nmemb > SIZE_MAX / size)
1.11 millert 97: errorx(1, "internal error, emalloc2() overflow");
1.6 millert 98:
1.5 millert 99: size *= nmemb;
1.11 millert 100: if ((ptr = malloc(size)) == NULL)
101: errorx(1, "unable to allocate memory");
1.1 millert 102: return(ptr);
103: }
104:
105: /*
106: * erealloc() calls the system realloc(3) and exits with an error if
107: * realloc(3) fails. You can call erealloc() with a NULL pointer even
108: * if the system realloc(3) does not support this.
109: */
1.11 millert 110: void *
1.1 millert 111: erealloc(ptr, size)
1.11 millert 112: void *ptr;
1.1 millert 113: size_t size;
114: {
115:
1.6 millert 116: if (size == 0)
1.11 millert 117: errorx(1, "internal error, tried to erealloc(0)");
1.6 millert 118:
1.11 millert 119: ptr = ptr ? realloc(ptr, size) : malloc(size);
1.6 millert 120: if (ptr == NULL)
1.11 millert 121: errorx(1, "unable to allocate memory");
1.5 millert 122: return(ptr);
123: }
124:
125: /*
126: * erealloc3() realloc(3)s nmemb * size bytes and exits with an error
127: * if overflow would occur or if the system malloc(3)/realloc(3) fails.
128: * You can call erealloc() with a NULL pointer even if the system realloc(3)
129: * does not support this.
130: */
1.11 millert 131: void *
1.5 millert 132: erealloc3(ptr, nmemb, size)
1.11 millert 133: void *ptr;
1.5 millert 134: size_t nmemb;
135: size_t size;
136: {
137:
1.6 millert 138: if (nmemb == 0 || size == 0)
1.11 millert 139: errorx(1, "internal error, tried to erealloc3(0)");
1.6 millert 140: if (nmemb > SIZE_MAX / size)
1.11 millert 141: errorx(1, "internal error, erealloc3() overflow");
1.6 millert 142:
1.5 millert 143: size *= nmemb;
1.11 millert 144: ptr = ptr ? realloc(ptr, size) : malloc(size);
1.6 millert 145: if (ptr == NULL)
1.11 millert 146: errorx(1, "unable to allocate memory");
1.1 millert 147: return(ptr);
148: }
149:
150: /*
151: * estrdup() is like strdup(3) except that it exits with an error if
152: * malloc(3) fails. NOTE: unlike strdup(3), estrdup(NULL) is legal.
153: */
154: char *
155: estrdup(src)
156: const char *src;
157: {
158: char *dst = NULL;
1.5 millert 159: size_t size;
1.1 millert 160:
161: if (src != NULL) {
1.5 millert 162: size = strlen(src) + 1;
163: dst = (char *) emalloc(size);
164: (void) memcpy(dst, src, size);
1.1 millert 165: }
166: return(dst);
167: }
168:
169: /*
170: * easprintf() calls vasprintf() and exits with an error if vasprintf()
171: * returns -1 (out of memory).
172: */
1.2 millert 173: int
1.1 millert 174: #ifdef __STDC__
175: easprintf(char **ret, const char *fmt, ...)
176: #else
1.9 millert 177: easprintf(ret, fmt, va_alist)
178: char **ret;
179: const char *fmt;
1.1 millert 180: va_dcl
181: #endif
182: {
183: int len;
184: va_list ap;
185: #ifdef __STDC__
186: va_start(ap, fmt);
187: #else
188: va_start(ap);
189: #endif
190: len = vasprintf(ret, fmt, ap);
191: va_end(ap);
192:
1.6 millert 193: if (len == -1)
1.11 millert 194: errorx(1, "unable to allocate memory");
1.2 millert 195: return(len);
1.1 millert 196: }
197:
198: /*
199: * evasprintf() calls vasprintf() and exits with an error if vasprintf()
200: * returns -1 (out of memory).
201: */
1.2 millert 202: int
1.1 millert 203: evasprintf(ret, format, args)
204: char **ret;
205: const char *format;
206: va_list args;
207: {
1.2 millert 208: int len;
1.1 millert 209:
1.6 millert 210: if ((len = vasprintf(ret, format, args)) == -1)
1.11 millert 211: errorx(1, "unable to allocate memory");
1.2 millert 212: return(len);
1.9 millert 213: }
214:
215: /*
216: * Wrapper for free(3) so we can depend on C89 semantics.
217: */
218: void
219: efree(ptr)
1.11 millert 220: void *ptr;
1.9 millert 221: {
222: if (ptr != NULL)
223: free(ptr);
1.1 millert 224: }
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