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Annotation of src/usr.bin/ssh/xmalloc.c, Revision 1.19

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