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Annotation of src/usr.bin/ssh/xmalloc.c, Revision 1.24

1.24    ! stevesk     1: /* $OpenBSD: xmalloc.c,v 1.23 2006/07/22 20:48:23 stevesk Exp $ */
1.1       deraadt     2: /*
1.5       deraadt     3:  * Author: Tatu Ylonen <ylo@cs.hut.fi>
                      4:  * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
                      5:  *                    All rights reserved
                      6:  * Versions of malloc and friends that check their results, and never return
                      7:  * failure (they call fatal if they encounter an error).
1.11      stevesk     8:  *
1.8       deraadt     9:  * As far as I am concerned, the code I have written for this software
                     10:  * can be used freely for any purpose.  Any derived versions of this
                     11:  * software must be clearly marked as such, and if the derived work is
                     12:  * incompatible with the protocol description in the RFC file, it must be
                     13:  * called by a name other than "ssh" or "Secure Shell".
1.5       deraadt    14:  */
1.1       deraadt    15:
                     16: #include "includes.h"
1.24    ! stevesk    17:
        !            18: #include <sys/param.h>
1.22      stevesk    19:
                     20: #include <stdarg.h>
1.23      stevesk    21: #include <string.h>
1.1       deraadt    22:
1.9       markus     23: #include "xmalloc.h"
                     24: #include "log.h"
1.1       deraadt    25:
1.4       markus     26: void *
                     27: xmalloc(size_t size)
1.1       deraadt    28: {
1.12      deraadt    29:        void *ptr;
                     30:
                     31:        if (size == 0)
                     32:                fatal("xmalloc: zero size");
                     33:        ptr = malloc(size);
1.4       markus     34:        if (ptr == NULL)
1.14      itojun     35:                fatal("xmalloc: out of memory (allocating %lu bytes)", (u_long) size);
1.4       markus     36:        return ptr;
1.1       deraadt    37: }
                     38:
1.4       markus     39: void *
1.18      djm        40: xcalloc(size_t nmemb, size_t size)
                     41: {
                     42:        void *ptr;
                     43:
                     44:        if (size == 0 || nmemb == 0)
                     45:                fatal("xcalloc: zero size");
1.21      deraadt    46:        if (SIZE_T_MAX / nmemb < size)
                     47:                fatal("xcalloc: nmemb * size > SIZE_T_MAX");
1.18      djm        48:        ptr = calloc(nmemb, size);
                     49:        if (ptr == NULL)
                     50:                fatal("xcalloc: out of memory (allocating %lu bytes)",
                     51:                    (u_long)(size * nmemb));
                     52:        return ptr;
                     53: }
                     54:
                     55: void *
1.19      djm        56: xrealloc(void *ptr, size_t nmemb, size_t size)
1.1       deraadt    57: {
1.4       markus     58:        void *new_ptr;
1.19      djm        59:        size_t new_size = nmemb * size;
1.1       deraadt    60:
1.12      deraadt    61:        if (new_size == 0)
1.13      markus     62:                fatal("xrealloc: zero size");
1.21      deraadt    63:        if (SIZE_T_MAX / nmemb < size)
                     64:                fatal("xrealloc: nmemb * size > SIZE_T_MAX");
1.4       markus     65:        if (ptr == NULL)
1.15      deraadt    66:                new_ptr = malloc(new_size);
                     67:        else
                     68:                new_ptr = realloc(ptr, new_size);
1.4       markus     69:        if (new_ptr == NULL)
1.19      djm        70:                fatal("xrealloc: out of memory (new_size %lu bytes)",
                     71:                    (u_long) new_size);
1.4       markus     72:        return new_ptr;
1.1       deraadt    73: }
                     74:
1.6       markus     75: void
1.4       markus     76: xfree(void *ptr)
1.1       deraadt    77: {
1.4       markus     78:        if (ptr == NULL)
                     79:                fatal("xfree: NULL pointer given as argument");
                     80:        free(ptr);
1.1       deraadt    81: }
                     82:
1.4       markus     83: char *
                     84: xstrdup(const char *str)
1.1       deraadt    85: {
1.16      stevesk    86:        size_t len;
1.12      deraadt    87:        char *cp;
1.2       deraadt    88:
1.16      stevesk    89:        len = strlen(str) + 1;
1.12      deraadt    90:        cp = xmalloc(len);
1.4       markus     91:        strlcpy(cp, str, len);
                     92:        return cp;
1.18      djm        93: }
                     94:
                     95: int
                     96: xasprintf(char **ret, const char *fmt, ...)
                     97: {
                     98:        va_list ap;
                     99:        int i;
                    100:
                    101:        va_start(ap, fmt);
                    102:        i = vasprintf(ret, fmt, ap);
                    103:        va_end(ap);
                    104:
                    105:        if (i < 0 || *ret == NULL)
                    106:                fatal("xasprintf: could not allocate memory");
                    107:
                    108:        return (i);
1.1       deraadt   109: }