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- Added preliminary versions of the exec() family functions.
git-svn-id: file:///Users/olsen/Code/migration-svn-zu-git/logical-line-staging/clib2/trunk@15110 87f5fb63-7c3d-0410-a384-fd976d0f7a62
This commit is contained in:
Olaf Barthel
216
library/unistd_execvp.c
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216
library/unistd_execvp.c
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/*
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* $Id: unistd_execvp.c,v 1.1 2006-08-01 14:27:52 obarthel Exp $
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*
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* :ts=4
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*
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* Portable ISO 'C' (1994) runtime library for the Amiga computer
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* Copyright (c) 2002-2006 by Olaf Barthel <olsen (at) sourcery.han.de>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Neither the name of Olaf Barthel nor the names of contributors
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* may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _UNISTD_HEADERS_H
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#include "unistd_headers.h"
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#endif /* _UNISTD_HEADERS_H */
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/****************************************************************************/
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/* The following is not part of the ISO 'C' (1994) standard. */
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/****************************************************************************/
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char ** __default_path_delimiter = ":";
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char ** __default_path = "/gcc/bin:/SDK/C:/SDK/Local/C:/C:.";
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/****************************************************************************/
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/* A local version of the BSD strsep() function. */
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static char *
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local_strsep(char ** string_ptr, const char * delimiter)
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{
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char * result = NULL;
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char * string;
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assert( string_ptr != NULL && delimiter != NULL );
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string = (*string_ptr);
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if(string != NULL)
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{
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char * token = string;
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char c;
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while(TRUE)
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{
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c = (*string++);
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/* Reached the end of the string? */
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if(c == '\0')
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{
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/* No further string data available. */
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(*string_ptr) = NULL;
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result = token;
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break;
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}
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/* Is that character a delimiter? */
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if(strchr(delimiter,c) != NULL)
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{
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/* NUL-terminate the string, overwriting
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the delimiter character */
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string[-1] = '\0';
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/* Scanning can resume with the next following
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character. */
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(*string_ptr) = string;
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result = token;
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break;
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}
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}
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}
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return(result);
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}
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/****************************************************************************/
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int
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execvp(const char *command,char * const argv[])
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{
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char * command_buffer = NULL;
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char * path_copy = NULL;
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int result = -1;
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char * bp;
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/* Do not allow null command */
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if(command == NULL || (*command) == '\0')
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{
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__set_errno(ENOENT);
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goto out;
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}
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/* If it's an absolute or relative path name, it's easy. */
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if(strchr(command,'/') != NULL || strchr(command,':') != NULL)
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{
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result = execve(command, argv, NULL /*environ*/);
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}
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else
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{
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size_t command_name_len = strlen(command);
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size_t command_buffer_size = 0;
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char * path_delimiter;
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char * path;
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char * search_prefix;
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size_t search_prefix_len;
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size_t complete_path_len;
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int error;
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/* We first look up the PATH environment variable because
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we will be making a copy of it. This avoids trouble
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lateron when we will be calling getenv() again. */
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path = getenv("PATH");
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if(path == NULL)
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path = __default_path;
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path_copy = strdup(path);
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if(path_copy == NULL)
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{
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__set_errno(ENOMEM);
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goto out;
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}
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path = path_copy;
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path_delimiter = getenv("PATH_SEPARATOR");
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if(path_delimiter == NULL)
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path_delimiter = __default_path_delimiter;
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while((search_prefix = local_strsep(&path,path_delimiter)) != NULL)
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{
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if((*search_prefix) == '\0')
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search_prefix = ".";
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search_prefix_len = strlen(search_prefix);
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complete_path_len = search_prefix_len + 1 + command_name_len;
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if(complete_path_len + 1 > command_buffer_size)
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{
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char * new_command_buffer;
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/* Allocate a little more memory than we
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really need. */
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new_command_buffer = malloc(complete_path_len + 10);
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if(new_command_buffer == NULL)
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{
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__set_errno(ENOMEM);
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goto out;
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}
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if(command_buffer != NULL)
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free(command_buffer);
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command_buffer = new_command_buffer;
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command_buffer_size = complete_path_len + 10;
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}
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/* Combine the search prefix with the command name. */
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memcpy(command_buffer,search_prefix,search_prefix_len);
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command_buffer[search_prefix_len] = '/';
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memcpy(&command_buffer[search_prefix_len+1],command,command_name_len);
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command_buffer[complete_path_len] = '\0';
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/* Now try to run that command. */
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result = execve(command_buffer, argv, NULL /*environ*/);
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/* Did it work? And if it didn't work, did it fail because
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the command to be run could not be executed? */
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error = __get_errno();
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if(result == 0 ||
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(error != EACCES &&
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error != EISDIR &&
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error != ENOENT &&
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error != ENOEXEC &&
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error != EPERM))
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{
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break;
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}
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/* Just in case somebody wants to quit... */
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__check_abort();
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}
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}
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out:
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if(path_copy != NULL)
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free(path_copy);
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if(command_buffer != NULL)
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free(command_buffer);
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return(result);
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}
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