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Annotation of src/usr.bin/rcs/xmalloc.c, Revision 1.1

1.1     ! joris       1: /* $OpenBSD: xmalloc.c,v 1.6 2006/03/28 02:13:44 ray Exp $ */
        !             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:
        !            16: #include "includes.h"
        !            17:
        !            18: #include "xmalloc.h"
        !            19:
        !            20: void *
        !            21: xmalloc(size_t size)
        !            22: {
        !            23:        void *ptr;
        !            24:
        !            25:        if (size == 0)
        !            26:                errx(1, "xmalloc: zero size");
        !            27:        ptr = malloc(size);
        !            28:        if (ptr == NULL)
        !            29:                errx(1,
        !            30:                    "xmalloc: out of memory (allocating %lu bytes)",
        !            31:                    (u_long) size);
        !            32:        return ptr;
        !            33: }
        !            34:
        !            35: void *
        !            36: xcalloc(size_t nmemb, size_t size)
        !            37: {
        !            38:        void *ptr;
        !            39:
        !            40:        if (size == 0 || nmemb == 0)
        !            41:                errx(1, "xcalloc: zero size");
        !            42:        if (SIZE_T_MAX / nmemb < size)
        !            43:                errx(1, "xcalloc: nmemb * size > SIZE_T_MAX");
        !            44:        ptr = calloc(nmemb, size);
        !            45:        if (ptr == NULL)
        !            46:                errx(1, "xcalloc: out of memory (allocating %lu bytes)",
        !            47:                    (u_long)(size * nmemb));
        !            48:        return ptr;
        !            49: }
        !            50:
        !            51: void *
        !            52: xrealloc(void *ptr, size_t nmemb, size_t size)
        !            53: {
        !            54:        void *new_ptr;
        !            55:        size_t new_size = nmemb * size;
        !            56:
        !            57:        if (new_size == 0)
        !            58:                errx(1, "xrealloc: zero size");
        !            59:        if (SIZE_T_MAX / nmemb < size)
        !            60:                errx(1, "xrealloc: nmemb * size > SIZE_T_MAX");
        !            61:        if (ptr == NULL)
        !            62:                new_ptr = malloc(new_size);
        !            63:        else
        !            64:                new_ptr = realloc(ptr, new_size);
        !            65:        if (new_ptr == NULL)
        !            66:                errx(1, "xrealloc: out of memory (new_size %lu bytes)",
        !            67:                    (u_long) new_size);
        !            68:        return new_ptr;
        !            69: }
        !            70:
        !            71: void
        !            72: xfree(void *ptr)
        !            73: {
        !            74:        if (ptr == NULL)
        !            75:                errx(1, "xfree: NULL pointer given as argument");
        !            76:        free(ptr);
        !            77: }
        !            78:
        !            79: char *
        !            80: xstrdup(const char *str)
        !            81: {
        !            82:        size_t len;
        !            83:        char *cp;
        !            84:
        !            85:        len = strlen(str) + 1;
        !            86:        cp = xmalloc(len);
        !            87:        strlcpy(cp, str, len);
        !            88:        return cp;
        !            89: }
        !            90:
        !            91: int
        !            92: xasprintf(char **ret, const char *fmt, ...)
        !            93: {
        !            94:        va_list ap;
        !            95:        int i;
        !            96:
        !            97:        va_start(ap, fmt);
        !            98:        i = vasprintf(ret, fmt, ap);
        !            99:        va_end(ap);
        !           100:
        !           101:        if (i < 0 || *ret == NULL)
        !           102:                errx(1, "xasprintf: could not allocate memory");
        !           103:
        !           104:        return (i);
        !           105: }