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Annotation of src/usr.bin/ssh/xmalloc.c, Revision 1.23

1.23    ! stevesk     1: /* $OpenBSD: xmalloc.c,v 1.22 2006/07/10 16:37:36 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"
1.22      stevesk    17:
                     18: #include <stdarg.h>
1.23    ! stevesk    19: #include <string.h>
1.1       deraadt    20:
1.9       markus     21: #include "xmalloc.h"
                     22: #include "log.h"
1.1       deraadt    23:
1.4       markus     24: void *
                     25: xmalloc(size_t size)
1.1       deraadt    26: {
1.12      deraadt    27:        void *ptr;
                     28:
                     29:        if (size == 0)
                     30:                fatal("xmalloc: zero size");
                     31:        ptr = malloc(size);
1.4       markus     32:        if (ptr == NULL)
1.14      itojun     33:                fatal("xmalloc: out of memory (allocating %lu bytes)", (u_long) size);
1.4       markus     34:        return ptr;
1.1       deraadt    35: }
                     36:
1.4       markus     37: void *
1.18      djm        38: xcalloc(size_t nmemb, size_t size)
                     39: {
                     40:        void *ptr;
                     41:
                     42:        if (size == 0 || nmemb == 0)
                     43:                fatal("xcalloc: zero size");
1.21      deraadt    44:        if (SIZE_T_MAX / nmemb < size)
                     45:                fatal("xcalloc: nmemb * size > SIZE_T_MAX");
1.18      djm        46:        ptr = calloc(nmemb, size);
                     47:        if (ptr == NULL)
                     48:                fatal("xcalloc: out of memory (allocating %lu bytes)",
                     49:                    (u_long)(size * nmemb));
                     50:        return ptr;
                     51: }
                     52:
                     53: void *
1.19      djm        54: xrealloc(void *ptr, size_t nmemb, size_t size)
1.1       deraadt    55: {
1.4       markus     56:        void *new_ptr;
1.19      djm        57:        size_t new_size = nmemb * size;
1.1       deraadt    58:
1.12      deraadt    59:        if (new_size == 0)
1.13      markus     60:                fatal("xrealloc: zero size");
1.21      deraadt    61:        if (SIZE_T_MAX / nmemb < size)
                     62:                fatal("xrealloc: nmemb * size > SIZE_T_MAX");
1.4       markus     63:        if (ptr == NULL)
1.15      deraadt    64:                new_ptr = malloc(new_size);
                     65:        else
                     66:                new_ptr = realloc(ptr, new_size);
1.4       markus     67:        if (new_ptr == NULL)
1.19      djm        68:                fatal("xrealloc: out of memory (new_size %lu bytes)",
                     69:                    (u_long) new_size);
1.4       markus     70:        return new_ptr;
1.1       deraadt    71: }
                     72:
1.6       markus     73: void
1.4       markus     74: xfree(void *ptr)
1.1       deraadt    75: {
1.4       markus     76:        if (ptr == NULL)
                     77:                fatal("xfree: NULL pointer given as argument");
                     78:        free(ptr);
1.1       deraadt    79: }
                     80:
1.4       markus     81: char *
                     82: xstrdup(const char *str)
1.1       deraadt    83: {
1.16      stevesk    84:        size_t len;
1.12      deraadt    85:        char *cp;
1.2       deraadt    86:
1.16      stevesk    87:        len = strlen(str) + 1;
1.12      deraadt    88:        cp = xmalloc(len);
1.4       markus     89:        strlcpy(cp, str, len);
                     90:        return cp;
1.18      djm        91: }
                     92:
                     93: int
                     94: xasprintf(char **ret, const char *fmt, ...)
                     95: {
                     96:        va_list ap;
                     97:        int i;
                     98:
                     99:        va_start(ap, fmt);
                    100:        i = vasprintf(ret, fmt, ap);
                    101:        va_end(ap);
                    102:
                    103:        if (i < 0 || *ret == NULL)
                    104:                fatal("xasprintf: could not allocate memory");
                    105:
                    106:        return (i);
1.1       deraadt   107: }