IABSD.fr/xenocara/app/fonttosfnt/env.c

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• Author : matthieu
  Date : 2006-11-26 14:07:37
  Hash : a79d551c
  Message : Importing from X.Org indiviual releases

• app/fonttosfnt/env.c

• /*
   * Provide setenv() and unsetenv() on platforms that don't have them.
   * From FreeBSD's libc.
   */
  
  /*
   * Copyright (c) 1987, 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. All advertising materials mentioning features or use of this software
   *    must display the following acknowledgement:
   *      This product includes software developed by the University of
   *      California, Berkeley and its contributors.
   * 4. 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.
   */
  
  /* $XFree86: xc/programs/xedit/lisp/env.c,v 1.1 2002/03/05 03:52:34 dawes Exp $ */
  
  
  #include <stdlib.h>
  #include <stddef.h>
  #include <string.h>
  
  extern char **environ;
  
  extern int setenv(const char *name, const char *value, int overwrite);
  extern void unsetenv(const char *name);
  
  static char *
  findenv(const char *name, int *offset)
  {
      int len, i;
      const char *np;
      char **p, *cp;
  
      if (name == NULL || environ == NULL)
  	return NULL;
  
      for (np = name; *np && *np != '='; ++np)
  	continue;
      len = np - name;
      for (p = environ; (cp = *p) != NULL; ++p) {
  	for (np = name, i = len; i && *cp; i--)
  	    if (*cp++ != *np++)
  		break;
  	if (i == 0 && *cp++ == '=') {
  	    *offset = p - environ;
  	    return cp;
  	}
      }
      return NULL;
  }
  
  /*
   * setenv --
   *      Set the value of the environmental variable "name" to be
   *      "value".  If overwrite is set, replace any current value.
   */
  
  int
  setenv(const char *name, const char *value, int overwrite)
  {
      static char **alloced;			/* if allocated space before */
      char *c;
      int l_value, offset;
  
      if (*value == '=')				/* no '=' in value */
  	++value;
      l_value = strlen(value);
      if ((c = findenv(name, &offset))) {		/* find if already exists */
  	if (!overwrite)
  	    return 0;
  	if (strlen(c) >= l_value) {		/* old larger; copy over */
  	    while ((*c++ = *value++))
  		;
  	    return 0;
  	}
      } else {					/* create new slot */
  	int cnt;
  	char **p;
  
  	for (p = environ, cnt = 0; *p; ++p, ++cnt)
  	    ;
  	if (alloced == environ) {		/* just increase size */
  	    p = (char **)realloc((char *)environ,
  				 sizeof(char *) * (cnt + 2));
  	    if (!p)
  		return -1;
  	    alloced = environ = p;
  	} else {				/* get new space */
  						/* copy old entries into it */
  	    p = malloc(sizeof(char *) * (cnt + 2));
  	    if (!p)
  		return -1;
  	    memcpy(p, environ, cnt * sizeof(char *));
  	    alloced = environ = p;
  	}
  	environ[cnt + 1] = NULL;
  	offset = cnt;
      }
      for (c = (char *)name; *c && *c != '='; ++c)	/* no '=' in name */
  	;
      if (!(environ[offset] =				/* name + '=' + value */
  			malloc((int)(c - name) + l_value + 2)))
  	return -1;
      for (c = environ[offset]; (*c = *name++) && *c != '='; ++c)
  	;
      for (*c++ = '='; (*c++ = *value++); )
  	;
      return 0;
  }
  
  /*
   * unsetenv(name) --
   *      Delete environmental variable "name".
   */
  
  void
  unsetenv(const char *name)
  {
      char **p;
      int offset;
  
      while (findenv(name, &offset))		/* if set multiple times */
  	for (p = &environ[offset];; ++p)
  	    if (!(*p = *(p + 1)))
  		break;
  }