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mescc: Mes C Library: Support diffutils: Add execl.

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* include/limits.h (CHAR_MAX): New macro.
* lib/posix/execl.c: New file.
* include/unistd.h: Declare it.
This commit is contained in:
Jan Nieuwenhuizen 2018-08-26 20:54:29 +02:00
parent fa4ba916ea
commit 543ae4df32
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4 changed files with 56 additions and 0 deletions
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1
include/limits.h
View file

@ -31,6 +31,7 @@
#define CHAR_BIT 8
#define UCHAR_MAX 255
#define CHAR_MAX 255
#define UINT_MAX 4294967295U
#define INT_MIN -2147483648
#define INT_MAX 2147483647

1
include/unistd.h
View file

@ -57,6 +57,7 @@ int access (char const *s, int mode);
unsigned int alarm (unsigned int seconds);
int close (int fd);
int execv (char const *file_name, char *const argv[]);
int execl (char const *file_name, char const *arg, ...);
int execve (char const *file, char *const argv[], char *const env[]);
int execvp (char const *file, char *const argv[]);
int fork (void);

2
lib/libc+gnu.c
View file

@ -103,3 +103,5 @@
#include <dirent/closedir.c>
#include <dirent/opendir.c>
#include <dirent/readdir.c>
#include <posix/execl.c>

52
lib/posix/execl.c Normal file
View file

@ -0,0 +1,52 @@
/* -*-comment-start: "//";comment-end:""-*-
* GNU Mes --- Maxwell Equations of Software
* Copyright © 2018 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
*
* This file is part of GNU Mes.
*
* GNU Mes 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.
*
* GNU Mes 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 GNU Mes. If not, see <http://www.gnu.org/licenses/>.
*/
#include <libmes.h>
#include <unistd.h>
int
execl (char const *file_name, char const *arg, ...)
{
if (__mes_debug () > 2)
{
eputs ("execl "); eputs (file_name); eputs ("\n");
}
char *argv[1000]; // POSIX minimum 4096
int i = 0;
va_list ap;
va_start (ap, arg);
argv[i++] = file_name;
arg = va_arg (ap, char const *);
while (arg)
{
argv[i++] = arg;
arg = va_arg (ap, char const *);
if (__mes_debug () > 2)
{
eputs ("arg["); eputs (itoa (i)); eputs ("]: "); eputs (argv[i-1]); eputs ("\n");
}
}
argv[i] = 0;
int r = execv (file_name, argv);
va_end (ap);
return r;
}