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/**
* slibc — Yet another C library
* Copyright © 2015, 2016 Mattias Andrée (maandree@member.fsf.org)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <unistd.h>
/**
* Search the environment variable $PATH for an executable
* file whose name is the specified name. Slashes are ignored
* and treated as any other character. $PATH is searched
* for left to right, and ':' is used as the path-delimiter.
* If $PATH is not defined, a fallback value for $PATH will be
* used.
*
* $PATH is not inspected if `name` starts with './', '../', or '/'.
*
* This function was added because it was useful in implementing
* the `exec`-function family.
*
* This is a slibc extension.
*
* @etymology Variant of (searchpath) that takes (2) arguments.
*
* @param name The name of the sought executable. Must not be `NULL`.
* @param fallback Value to use instead of the value of $PATH, if
* path is not defined. If `NULL` the default value
* for $PATH is used.
* @return The pathname of the sought file, `NULL` on error,
* or if not found. Files that are not executable
* are (almost) ignored.
*
* @throws ENOMEM The process cannot allocate enough memory.
* @throws ENOENT There are no directories listed in $PATH, or
* the sought file is not exist inside $PATH.
* @throws EACCES None of the candidates (with at least one candidate)
* are executable by the current user.
* @throws Any exception defined for access(3), except for `EROFS`,
* these when encountered, the search is aborted, unless
* the error is `ENOENT` or `EACCES`.
*
* @since Always.
*/
char* searchpath2(const char* name, const char* fallback)
{
return searchpath3(name, fallback, "");
}
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