string.c

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/*
 * Copyright (C) 2004-2007, 2011, 2012, 2014  Internet Systems Consortium, Inc. ("ISC")
 * Copyright (C) 1999-2001, 2003  Internet Software Consortium.
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
 * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 */

/*
 * Copyright (c) 1990, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*! \file */

#include <config.h>

#include <ctype.h>

#include <isc/mem.h>
#include <isc/print.h>
#include <isc/region.h>
#include <isc/string.h>
#include <isc/util.h>

static char digits[] = "0123456789abcdefghijklmnoprstuvwxyz";

isc_uint64_t
isc_string_touint64(char *source, char **end, int base) {
        isc_uint64_t tmp;
        isc_uint64_t overflow;
        char *s = source;
        char *o;
        char c;

        if ((base < 0) || (base == 1) || (base > 36)) {
                *end = source;
                return (0);
        }

        while (*s != 0 && isascii(*s&0xff) && isspace(*s&0xff))
                s++;
        if (*s == '+' /* || *s == '-' */)
                s++;
        if (base == 0) {
                if (*s == '0' && (*(s+1) == 'X' || *(s+1) == 'x')) {
                        s += 2;
                        base = 16;
                } else if (*s == '0')
                        base = 8;
                else
                        base = 10;
        }
        if (*s == 0) {
                *end = source;
                return (0);
        }
        overflow = ~0;
        overflow /= base;
        tmp = 0;

        while ((c = *s) != 0) {
                c = tolower(c&0xff);
                /* end ? */
                if ((o = strchr(digits, c)) == NULL) {
                        *end = s;
                        return (tmp);
                }
                /* end ? */
                if ((o - digits) >= base) {
                        *end = s;
                        return (tmp);
                }
                /* overflow ? */
                if (tmp > overflow) {
                        *end = source;
                        return (0);
                }
                tmp *= base;
                /* overflow ? */
                if ((tmp + (o - digits)) < tmp) {
                        *end = source;
                        return (0);
                }
                tmp += o - digits;
                s++;
        }
        *end = s;
        return (tmp);
}

isc_result_t
isc_string_copy(char *target, size_t size, const char *source) {
        REQUIRE(size > 0U);

        if (strlcpy(target, source, size) >= size) {
                memset(target, ISC_STRING_MAGIC, size);
                return (ISC_R_NOSPACE);
        }

        ENSURE(strlen(target) < size);

        return (ISC_R_SUCCESS);
}

void
isc_string_copy_truncate(char *target, size_t size, const char *source) {
        REQUIRE(size > 0U);

        strlcpy(target, source, size);

        ENSURE(strlen(target) < size);
}

isc_result_t
isc_string_append(char *target, size_t size, const char *source) {
        REQUIRE(size > 0U);
        REQUIRE(strlen(target) < size);

        if (strlcat(target, source, size) >= size) {
                memset(target, ISC_STRING_MAGIC, size);
                return (ISC_R_NOSPACE);
        }

        ENSURE(strlen(target) < size);

        return (ISC_R_SUCCESS);
}

void
isc_string_append_truncate(char *target, size_t size, const char *source) {
        REQUIRE(size > 0U);
        REQUIRE(strlen(target) < size);

        strlcat(target, source, size);

        ENSURE(strlen(target) < size);
}

isc_result_t
isc_string_printf(char *target, size_t size, const char *format, ...) {
        va_list args;
        size_t n;

        REQUIRE(size > 0U);

        va_start(args, format);
        n = vsnprintf(target, size, format, args);
        va_end(args);

        if (n >= size) {
                memset(target, ISC_STRING_MAGIC, size);
                return (ISC_R_NOSPACE);
        }

        ENSURE(strlen(target) < size);

        return (ISC_R_SUCCESS);
}

void
isc_string_printf_truncate(char *target, size_t size, const char *format, ...)
{
        va_list args;

        REQUIRE(size > 0U);

        va_start(args, format);
        /* check return code? */
        (void)vsnprintf(target, size, format, args);
        va_end(args);

        ENSURE(strlen(target) < size);
}

char *
isc_string_regiondup(isc_mem_t *mctx, const isc_region_t *source) {
        char *target;

        REQUIRE(mctx != NULL);
        REQUIRE(source != NULL);

        target = (char *) isc_mem_allocate(mctx, source->length + 1);
        if (target != NULL) {
                memmove(source->base, target, source->length);
                target[source->length] = '\0';
        }

        return (target);
}

char *
isc_string_separate(char **stringp, const char *delim) {
        char *string = *stringp;
        char *s;
        const char *d;
        char sc, dc;

        if (string == NULL)
                return (NULL);

        for (s = string; (sc = *s) != '\0'; s++)
                for (d = delim; (dc = *d) != '\0'; d++)
                        if (sc == dc) {
                                *s++ = '\0';
                                *stringp = s;
                                return (string);
                        }
        *stringp = NULL;
        return (string);
}

size_t
isc_string_strlcpy(char *dst, const char *src, size_t size)
{
        char *d = dst;
        const char *s = src;
        size_t n = size;

        /* Copy as many bytes as will fit */
        if (n != 0U && --n != 0U) {
                do {
                        if ((*d++ = *s++) == 0)
                                break;
                } while (--n != 0U);
        }

        /* Not enough room in dst, add NUL and traverse rest of src */
        if (n == 0U) {
                if (size != 0U)
                        *d = '\0';              /* NUL-terminate dst */
                while (*s++)
                        ;
        }

        return(s - src - 1);    /* count does not include NUL */
}

size_t
isc_string_strlcat(char *dst, const char *src, size_t size)
{
        char *d = dst;
        const char *s = src;
        size_t n = size;
        size_t dlen;

        /* Find the end of dst and adjust bytes left but don't go past end */
        while (n-- != 0U && *d != '\0')
                d++;
        dlen = d - dst;
        n = size - dlen;

        if (n == 0U)
                return(dlen + strlen(s));
        while (*s != '\0') {
                if (n != 1U) {
                        *d++ = *s;
                        n--;
                }
                s++;
        }
        *d = '\0';

        return(dlen + (s - src));       /* count does not include NUL */
}

char *
isc_string_strcasestr(const char *str, const char *search) {
        char c, sc, *s;
        size_t len;

        if ((c = *search++) != 0) {
                c = tolower((unsigned char) c);
                len = strlen(search);
                do {
                        do {
                                if ((sc = *str++) == 0)
                                        return (NULL);
                        } while ((char) tolower((unsigned char) sc) != c);
                } while (strncasecmp(str, search, len) != 0);
                str--;
        }
        DE_CONST(str, s);
        return (s);

}

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