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/************************************************************
* mkconfig.c
*
* Copyright (C) 2007 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* 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. Neither the name Gregory Nutt 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 COPYRIGHT HOLDERS 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
* COPYRIGHT OWNER 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.
*
************************************************************/
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <unistd.h>
#include <errno.h>
#define DEFCONFIG "defconfig"
#define LINESIZE 256
static char line[LINESIZE+1];
static char *skip_space(char *ptr)
{
while (*ptr && isspace(*ptr)) ptr++;
return ptr;
}
static char *find_end(char *ptr)
{
while (*ptr && (isalnum(*ptr) || *ptr == '_')) ptr++;
return ptr;
}
static char *find_comment(char *ptr)
{
while (*ptr && *ptr != '"' && *ptr != '\n') ptr++;
if (*ptr == '"') ptr++;
return ptr;
}
static char *read_line(FILE *stream)
{
char *ptr;
for (;;)
{
line[LINESIZE] = '\0';
if (!fgets(line, LINESIZE, stream))
{
return NULL;
}
else
{
ptr = skip_space(line);
if (*ptr && *ptr != '#' && *ptr != '\n')
{
return ptr;
}
}
}
}
static void parse_line(char *ptr, char **varname, char **varval)
{
*varname = ptr;
*varval = NULL;
ptr = find_end(ptr);
if (*ptr && *ptr != '=')
{
*ptr = '\0';
ptr = skip_space(ptr + 1);
}
if (*ptr == '=')
{
*ptr = '\0';
ptr = skip_space(ptr + 1);
if (*ptr)
{
*varval = ptr;
if (*ptr == '"')
{
ptr = find_comment(ptr);
}
else
{
ptr = find_end(ptr);
}
*ptr = '\0';
}
}
}
static void parse_file(FILE *stream)
{
char *varname;
char *varval;
char *ptr;
do
{
ptr = read_line(stream);
if (ptr)
{
parse_line(ptr, &varname, &varval);
if (varname)
{
if (!varval || strcmp(varval, "n") == 0)
{
printf("#undef %s\n", varname);
}
else if (strcmp(varval, "y") == 0)
{
printf("#define %s 1\n", varname);
}
else
{
printf("#define %s %s\n", varname, varval);
}
}
}
}
while (ptr);
}
static void show_usage(const char *progname)
{
fprintf(stderr, "USAGE: %s <abs path to defconfig>\n", progname);
exit(1);
}
int main(int argc, char **argv, char **envp)
{
char *filepath;
FILE *stream;
int status;
if (argc != 2)
{
fprintf(stderr, "Unexpected number of arguments\n");
show_usage(argv[0]);
}
status = asprintf(&filepath, "%s/" DEFCONFIG, argv[1]);
if (status < 0)
{
fprintf(stderr, "asprintf failed\n");
exit(2);
}
stream= fopen(filepath, "r");
if (!stream)
{
fprintf(stderr, "open %s failed: %s\n", filepath, strerror(errno));
exit(3);
}
printf("/* config.h -- Autogenerated! Do not edit. */\n\n");
printf("#ifndef __ARCH_CONFIG_H\n");
printf("#define __ARCH_CONFIG_H\n\n");
printf("/* Architecture-specific options *************************/\n\n");
parse_file(stream);
printf("\n/* Sanity Checks *****************************************/\n\n");
printf("/* The correct way to disable RR scheduling is to set the\n");
printf(" * timeslice to zero.\n");
printf(" */\n\n");
printf("#ifndef CONFIG_RR_INTERVAL\n");
printf("# define CONFIG_RR_INTERVAL 0\n");
printf("#endif\n\n");
printf("/* The correct way to disable filesystem supuport is to set the\n");
printf(" * number of file descriptors to zero.\n");
printf(" */\n\n");
printf("#ifndef CONFIG_NFILE_DESCRIPTORS\n");
printf("# define CONFIG_NFILE_DESCRIPTORS 0\n");
printf("#endif\n\n");
printf("/* If a console is selected, then make sure that there are\n");
printf(" * resources for 3 file descriptors and, if any streams are\n");
printf(" * selected, also for 3 file streams.\n");
printf(" */\n\n");
printf("#ifdef CONFIG_DEV_CONSOLE\n");
printf("# if CONFIG_NFILE_DESCRIPTORS < 3\n");
printf("# undef CONFIG_NFILE_DESCRIPTORS\n");
printf("# define CONFIG_NFILE_DESCRIPTORS 3\n");
printf("# endif\n\n");
printf("# if CONFIG_NFILE_STREAMS > 0 && CONFIG_NFILE_STREAMS < 3\n");
printf("# undef CONFIG_NFILE_STREAMS\n");
printf("# define CONFIG_NFILE_STREAMS 3\n");
printf("# endif\n");
printf("#endif\n\n");
printf("/* If no file descriptors are configured, then make certain no\n");
printf(" * streams are configured either.\n");
printf(" */\n\n");
printf("#if CONFIG_NFILE_DESCRIPTORS == 0\n");
printf("# undef CONFIG_NFILE_STREAMS\n");
printf("# define CONFIG_NFILE_STREAMS 0\n");
printf("#endif\n\n");
printf("/* If no file streams are configured, then make certain that\n");
printf(" * buffered I/O support is disabled.\n");
printf(" */\n\n");
printf("#if CONFIG_NFILE_STREAMS == 0\n");
printf("# undef CONFIG_STDIO_BUFFER_SIZE\n");
printf("# define CONFIG_STDIO_BUFFER_SIZE 0\n");
printf("#endif\n\n");
printf("/* Verbose debug only makes sense if debug is enabled */\n\n");
printf("#ifndef CONFIG_DEBUG\n");
printf("# undef CONFIG_DEBUG_VERBOSE\n");
printf("#endif\n\n");
printf("#endif /* __ARCH_CONFIG_H */\n");
fclose(stream);
return 0;
}
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