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

1.1     ! nicm        1: /* $OpenBSD: xmalloc.c,v 1.8 2015/03/26 15:17:30 okan 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 <err.h>
        !            17: #include <stdarg.h>
        !            18: #include <stdint.h>
        !            19: #include <stdio.h>
        !            20: #include <stdlib.h>
        !            21: #include <string.h>
        !            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 %zu bytes)",
        !            36:                    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_MAX / nmemb < size)
        !            48:                errx(1, "xcalloc: nmemb * size > SIZE_MAX");
        !            49:        ptr = calloc(nmemb, size);
        !            50:        if (ptr == NULL)
        !            51:                errx(1, "xcalloc: out of memory (allocating %zu bytes)",
        !            52:                    (size * nmemb));
        !            53:        return ptr;
        !            54: }
        !            55:
        !            56: void *
        !            57: xreallocarray(void *ptr, size_t nmemb, size_t size)
        !            58: {
        !            59:        void *new_ptr;
        !            60:
        !            61:        new_ptr = reallocarray(ptr, nmemb, size);
        !            62:        if (new_ptr == NULL)
        !            63:                errx(1, "xreallocarray: out of memory (new_size %zu bytes)",
        !            64:                    nmemb * size);
        !            65:        return new_ptr;
        !            66: }
        !            67:
        !            68: void
        !            69: xfree(void *ptr)
        !            70: {
        !            71:        if (ptr == NULL)
        !            72:                errx(1, "xfree: NULL pointer given as argument");
        !            73:        free(ptr);
        !            74: }
        !            75:
        !            76: char *
        !            77: xstrdup(const char *str)
        !            78: {
        !            79:        size_t len;
        !            80:        char *cp;
        !            81:
        !            82:        len = strlen(str) + 1;
        !            83:        cp = xmalloc(len);
        !            84:        if (strlcpy(cp, str, len) >= len)
        !            85:                errx(1, "xstrdup: string truncated");
        !            86:        return cp;
        !            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:                errx(1, "xasprintf: could not allocate memory");
        !           101:
        !           102:        return (i);
        !           103: }