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Annotation of src/usr.bin/ssh/xmalloc.c, Revision 1.20

1.20    ! djm         1: /* $OpenBSD$ */
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"
                     17:
1.9       markus     18: #include "xmalloc.h"
                     19: #include "log.h"
1.1       deraadt    20:
1.4       markus     21: void *
                     22: xmalloc(size_t size)
1.1       deraadt    23: {
1.12      deraadt    24:        void *ptr;
                     25:
                     26:        if (size == 0)
                     27:                fatal("xmalloc: zero size");
                     28:        ptr = malloc(size);
1.4       markus     29:        if (ptr == NULL)
1.14      itojun     30:                fatal("xmalloc: out of memory (allocating %lu bytes)", (u_long) size);
1.4       markus     31:        return ptr;
1.1       deraadt    32: }
                     33:
1.4       markus     34: void *
1.18      djm        35: xcalloc(size_t nmemb, size_t size)
                     36: {
                     37:        void *ptr;
                     38:
1.19      djm        39:        if (nmemb && size && SIZE_T_MAX / nmemb < size)
1.18      djm        40:                fatal("xcalloc: nmemb * size > SIZE_T_MAX");
                     41:        if (size == 0 || nmemb == 0)
                     42:                fatal("xcalloc: zero size");
                     43:        ptr = calloc(nmemb, size);
                     44:        if (ptr == NULL)
                     45:                fatal("xcalloc: out of memory (allocating %lu bytes)",
                     46:                    (u_long)(size * nmemb));
                     47:        return ptr;
                     48: }
                     49:
                     50: void *
1.19      djm        51: xrealloc(void *ptr, size_t nmemb, size_t size)
1.1       deraadt    52: {
1.4       markus     53:        void *new_ptr;
1.19      djm        54:        size_t new_size = nmemb * size;
1.1       deraadt    55:
1.19      djm        56:        if (nmemb && size && SIZE_T_MAX / nmemb < size)
                     57:                fatal("xrealloc: nmemb * size > SIZE_T_MAX");
1.12      deraadt    58:        if (new_size == 0)
1.13      markus     59:                fatal("xrealloc: zero size");
1.4       markus     60:        if (ptr == NULL)
1.15      deraadt    61:                new_ptr = malloc(new_size);
                     62:        else
                     63:                new_ptr = realloc(ptr, new_size);
1.4       markus     64:        if (new_ptr == NULL)
1.19      djm        65:                fatal("xrealloc: out of memory (new_size %lu bytes)",
                     66:                    (u_long) new_size);
1.4       markus     67:        return new_ptr;
1.1       deraadt    68: }
                     69:
1.6       markus     70: void
1.4       markus     71: xfree(void *ptr)
1.1       deraadt    72: {
1.4       markus     73:        if (ptr == NULL)
                     74:                fatal("xfree: NULL pointer given as argument");
                     75:        free(ptr);
1.1       deraadt    76: }
                     77:
1.4       markus     78: char *
                     79: xstrdup(const char *str)
1.1       deraadt    80: {
1.16      stevesk    81:        size_t len;
1.12      deraadt    82:        char *cp;
1.2       deraadt    83:
1.16      stevesk    84:        len = strlen(str) + 1;
1.12      deraadt    85:        cp = xmalloc(len);
1.4       markus     86:        strlcpy(cp, str, len);
                     87:        return cp;
1.18      djm        88: }
                     89:
                     90: int
                     91: xasprintf(char **ret, const char *fmt, ...)
                     92: {
                     93:        va_list ap;
                     94:        int i;
                     95:
                     96:        va_start(ap, fmt);
                     97:        i = vasprintf(ret, fmt, ap);
                     98:        va_end(ap);
                     99:
                    100:        if (i < 0 || *ret == NULL)
                    101:                fatal("xasprintf: could not allocate memory");
                    102:
                    103:        return (i);
1.1       deraadt   104: }