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Annotation of src/usr.bin/rcs/xmalloc.c, Revision 1.3

1.3     ! xsa         1: /* $OpenBSD: xmalloc.c,v 1.2 2006/04/29 05:31:28 ray Exp $ */
1.1       joris       2: /*
                      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).
                      8:  *
                      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".
                     14:  */
                     15:
1.3     ! xsa        16: #include <err.h>
        !            17: #include <limits.h>
        !            18: #include <stdarg.h>
        !            19: #include <stdio.h>
        !            20: #include <stdlib.h>
        !            21: #include <string.h>
1.1       joris      22:
                     23: #include "xmalloc.h"
                     24:
                     25: void *
                     26: xmalloc(size_t size)
                     27: {
                     28:        void *ptr;
                     29:
                     30:        if (size == 0)
                     31:                errx(1, "xmalloc: zero size");
                     32:        ptr = malloc(size);
                     33:        if (ptr == NULL)
                     34:                errx(1,
                     35:                    "xmalloc: out of memory (allocating %lu bytes)",
                     36:                    (u_long) size);
                     37:        return ptr;
                     38: }
                     39:
                     40: void *
                     41: xcalloc(size_t nmemb, size_t size)
                     42: {
                     43:        void *ptr;
                     44:
                     45:        if (size == 0 || nmemb == 0)
                     46:                errx(1, "xcalloc: zero size");
                     47:        if (SIZE_T_MAX / nmemb < size)
                     48:                errx(1, "xcalloc: nmemb * size > SIZE_T_MAX");
                     49:        ptr = calloc(nmemb, size);
                     50:        if (ptr == NULL)
                     51:                errx(1, "xcalloc: out of memory (allocating %lu bytes)",
                     52:                    (u_long)(size * nmemb));
                     53:        return ptr;
                     54: }
                     55:
                     56: void *
                     57: xrealloc(void *ptr, size_t nmemb, size_t size)
                     58: {
                     59:        void *new_ptr;
                     60:        size_t new_size = nmemb * size;
                     61:
                     62:        if (new_size == 0)
                     63:                errx(1, "xrealloc: zero size");
                     64:        if (SIZE_T_MAX / nmemb < size)
                     65:                errx(1, "xrealloc: nmemb * size > SIZE_T_MAX");
                     66:        if (ptr == NULL)
                     67:                new_ptr = malloc(new_size);
                     68:        else
                     69:                new_ptr = realloc(ptr, new_size);
                     70:        if (new_ptr == NULL)
                     71:                errx(1, "xrealloc: out of memory (new_size %lu bytes)",
                     72:                    (u_long) new_size);
                     73:        return new_ptr;
                     74: }
                     75:
                     76: void
                     77: xfree(void *ptr)
                     78: {
                     79:        if (ptr == NULL)
                     80:                errx(1, "xfree: NULL pointer given as argument");
                     81:        free(ptr);
                     82: }
                     83:
                     84: char *
                     85: xstrdup(const char *str)
                     86: {
                     87:        size_t len;
                     88:        char *cp;
                     89:
                     90:        len = strlen(str) + 1;
                     91:        cp = xmalloc(len);
1.2       ray        92:        if (strlcpy(cp, str, len) >= len)
                     93:                errx(1, "xstrdup: string truncated");
1.1       joris      94:        return cp;
                     95: }
                     96:
                     97: int
                     98: xasprintf(char **ret, const char *fmt, ...)
                     99: {
                    100:        va_list ap;
                    101:        int i;
                    102:
                    103:        va_start(ap, fmt);
                    104:        i = vasprintf(ret, fmt, ap);
                    105:        va_end(ap);
                    106:
                    107:        if (i < 0 || *ret == NULL)
                    108:                errx(1, "xasprintf: could not allocate memory");
                    109:
                    110:        return (i);
                    111: }