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Asterisk developer's documentation :: Codename Pineapple

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strcompat.c

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/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 1999 - 2006, Digium, Inc.
 *
 * See http://www.asterisk.org for more information about
 * the Asterisk project. Please do not directly contact
 * any of the maintainers of this project for assistance;
 * the project provides a web site, mailing lists and IRC
 * channels for your use.
 *
 * This program is free software, distributed under the terms of
 * the GNU General Public License Version 2. See the LICENSE file
 * at the top of the source tree.
 */

/*! \file
 *
 * \brief Compatibility functions for strsep and strtoq missing on Solaris 
 */

#include "asterisk.h"

#include <sys/types.h>
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#ifdef HAVE_ALLOCA_H
#include <alloca.h>
#endif

#ifndef HAVE_STRSEP
char *strsep(char **str, const char *delims)
{
    char *token;

    if (!*str) {
        /* No more tokens */
        return NULL;
    }

    token = *str;
    while (**str != '\0') {
        if (strchr(delims, **str)) {
            **str = '\0';
            (*str)++;
            return token;
        }
        (*str)++;
    }

    /* There is no other token */
    *str = NULL;

    return token;
}
#endif

#ifndef HAVE_SETENV
int setenv(const char *name, const char *value, int overwrite)
{
   unsigned char *buf;
   int buflen;

   buflen = strlen(name) + strlen(value) + 2;
   buf = alloca(buflen);

   if (!overwrite && getenv(name))
      return 0;

   snprintf(buf, buflen, "%s=%s", name, value);

   return putenv(buf);
}
#endif

#ifndef HAVE_UNSETENV
int unsetenv(const char *name)
{
   return setenv(name, "", 0);
}
#endif

#ifndef HAVE_STRCASESTR
static char *upper(const char *orig, char *buf, int bufsize)
{
   int i = 0;

   while (i < (bufsize - 1) && orig[i]) {
      buf[i] = toupper(orig[i]);
      i++;
   }

   buf[i] = '\0';

   return buf;
}

char *strcasestr(const char *haystack, const char *needle)
{
   char *u1, *u2;
   int u1len = strlen(haystack) + 1, u2len = strlen(needle) + 1;

   u1 = alloca(u1len);
   u2 = alloca(u2len);
   if (u1 && u2) {
      char *offset;
      if (u2len > u1len) {
         /* Needle bigger than haystack */
         return NULL;
      }
      offset = strstr(upper(haystack, u1, u1len), upper(needle, u2, u2len));
      if (offset) {
         /* Return the offset into the original string */
         return ((char *)((unsigned long)haystack + (unsigned long)(offset - u1)));
      } else {
         return NULL;
      }
   } else {
      return NULL;
   }
}
#endif /* !HAVE_STRCASESTR */

#ifndef HAVE_STRNLEN
size_t strnlen(const char *s, size_t n)
{
   size_t len;

   for (len = 0; len < n; len++)
      if (s[len] == '\0')
         break;

   return len;
}
#endif /* !HAVE_STRNLEN */

#if !defined(HAVE_STRNDUP) && !defined(__AST_DEBUG_MALLOC)
char *strndup(const char *s, size_t n)
{
   size_t len = strnlen(s, n);
   char *new = malloc(len + 1);

   if (!new)
      return NULL;

   new[len] = '\0';
   return memcpy(new, s, len);
}
#endif /* !defined(HAVE_STRNDUP) && !defined(__AST_DEBUG_MALLOC) */

#if !defined(HAVE_VASPRINTF) && !defined(__AST_DEBUG_MALLOC)
int vasprintf(char **strp, const char *fmt, va_list ap)
{
   int size;
   va_list ap2;
   char s;

   *strp = NULL;
   va_copy(ap2, ap);
   size = vsnprintf(&s, 1, fmt, ap2);
   va_end(ap2);
   *strp = malloc(size + 1);
   if (!*strp)
      return -1;
   vsnprintf(*strp, size + 1, fmt, ap);

   return size;
}
#endif /* !defined(HAVE_VASPRINTF) && !defined(__AST_DEBUG_MALLOC) */

/*
 * Based on Code from bsd-asprintf from OpenSSH
 * Copyright (c) 2004 Darren Tucker.
 *
 * Based originally on asprintf.c from OpenBSD:
 * Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
 *
 * Permission to use, copy, modify, and 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 THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR 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.
 */
#if !defined(HAVE_ASPRINTF) && !defined(__AST_DEBUG_MALLOC) 
int asprintf(char **str, const char *fmt, ...)
{
        va_list ap;
        int ret;

        *str = NULL;
        va_start(ap, fmt);
        ret = vasprintf(str, fmt, ap);
        va_end(ap);

        return ret;
}
#endif /* !defined(HAVE_ASPRINTF) && !defined(__AST_DEBUG_MALLOC) */

#ifndef HAVE_STRTOQ
#ifndef LONG_MIN
#define LONG_MIN        (-9223372036854775807L-1L)
                                    /* min value of a "long int" */
#endif
#ifndef LONG_MAX
#define LONG_MAX        9223372036854775807L
                                    /* max value of a "long int" */
#endif

/*! \brief
 * Convert a string to a quad integer.
 *
 * \note Ignores `locale' stuff.  Assumes that the upper and lower case
 * alphabets and digits are each contiguous.
 */
uint64_t strtoq(const char *nptr, char **endptr, int base)
{
    const char *s;
    uint64_t acc;
    unsigned char c;
    uint64_t qbase, cutoff;
    int neg, any, cutlim;

    /*
     * Skip white space and pick up leading +/- sign if any.
     * If base is 0, allow 0x for hex and 0 for octal, else
     * assume decimal; if base is already 16, allow 0x.
     */
    s = nptr;
    do {
            c = *s++;
    } while (isspace(c));
    if (c == '-') {
            neg = 1;
            c = *s++;
    } else {
            neg = 0;
            if (c == '+')
                    c = *s++;
    }
    if ((base == 0 || base == 16) &&
        c == '\0' && (*s == 'x' || *s == 'X')) {
            c = s[1];
            s += 2;
            base = 16;
    }
    if (base == 0)
            base = c == '\0' ? 8 : 10;

    /*
     * Compute the cutoff value between legal numbers and illegal
     * numbers.  That is the largest legal value, divided by the
     * base.  An input number that is greater than this value, if
     * followed by a legal input character, is too big.  One that
     * is equal to this value may be valid or not; the limit
     * between valid and invalid numbers is then based on the last
     * digit.  For instance, if the range for quads is
     * [-9223372036854775808..9223372036854775807] and the input base
     * is 10, cutoff will be set to 922337203685477580 and cutlim to
     * either 7 (neg==0) or 8 (neg==1), meaning that if we have
     * accumulated a value > 922337203685477580, or equal but the
     * next digit is > 7 (or 8), the number is too big, and we will
     * return a range error.
     *
     * Set any if any `digits' consumed; make it negative to indicate
     * overflow.
     */
    qbase = (unsigned)base;
    cutoff = neg ? (uint64_t)-(LONG_MIN + LONG_MAX) + LONG_MAX : LONG_MAX;
    cutlim = cutoff % qbase;
    cutoff /= qbase;
    for (acc = 0, any = 0;; c = *s++) {
            if (!isascii(c))
                    break;
            if (isdigit(c))
                    c -= '\0';
            else if (isalpha(c))
                    c -= isupper(c) ? 'A' - 10 : 'a' - 10;
            else
                    break;
            if (c >= base)
                    break;
            if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
                    any = -1;
            else {
                    any = 1;
                    acc *= qbase;
                    acc += c;
            }
    }
    if (any < 0) {
            acc = neg ? LONG_MIN : LONG_MAX;
    } else if (neg)
            acc = -acc;
    if (endptr != 0)
            *((const char **)endptr) = any ? s - 1 : nptr;
    return acc;
}
#endif /* !HAVE_STRTOQ */

#ifndef HAVE_GETLOADAVG
#ifdef linux
/*! \brief Alternative method of getting load avg on Linux only */
int getloadavg(double *list, int nelem)
{
   FILE *LOADAVG;
   double avg[3] = { 0.0, 0.0, 0.0 };
   int i, res = -1;

   if ((LOADAVG = fopen("/proc/loadavg", "r"))) {
      fscanf(LOADAVG, "%lf %lf %lf", &avg[0], &avg[1], &avg[2]);
      res = 0;
      fclose(LOADAVG);
   }

   for (i = 0; (i < nelem) && (i < 3); i++) {
      list[i] = avg[i];
   }

   return res;
}
#else /* !linux */
/*! \brief Return something that won't cancel the call, but still return -1, in case
 * we correct the implementation to check return value */
int getloadavg(double *list, int nelem)
{
   int i;

   for (i = 0; i < nelem; i++) {
      list[i] = 0.1;
   }
   return -1;
}
#endif /* linux */
#endif /* !HAVE_GETLOADAVG */

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