274 lines
8.1 KiB
C
274 lines
8.1 KiB
C
/************************************************************
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* mkconfig.c
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*
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* Copyright (C) 2007 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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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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* 1. 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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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name Gregory Nutt nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* 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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************************************************************/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <limits.h>
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#include <ctype.h>
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#include <unistd.h>
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#include <errno.h>
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#define DEFCONFIG ".config"
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#define LINESIZE ( PATH_MAX > 256 ? PATH_MAX : 256 )
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static char line[LINESIZE+1];
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static char *skip_space(char *ptr)
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{
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while (*ptr && isspace(*ptr)) ptr++;
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return ptr;
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}
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static char *find_name_end(char *ptr)
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{
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while (*ptr && (isalnum(*ptr) || *ptr == '_')) ptr++;
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return ptr;
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}
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static char *find_value_end(char *ptr)
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{
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while (*ptr && !isspace(*ptr))
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{
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if (*ptr == '"')
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{
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do ptr++; while (*ptr && *ptr != '"');
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if (*ptr) ptr++;
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}
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else
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{
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do ptr++; while (*ptr && !isspace(*ptr) && *ptr != '"');
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}
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}
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return ptr;
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}
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static char *read_line(FILE *stream)
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{
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char *ptr;
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for (;;)
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{
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line[LINESIZE] = '\0';
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if (!fgets(line, LINESIZE, stream))
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{
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return NULL;
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}
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else
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{
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ptr = skip_space(line);
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if (*ptr && *ptr != '#' && *ptr != '\n')
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{
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return ptr;
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}
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}
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}
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}
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static void parse_line(char *ptr, char **varname, char **varval)
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{
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*varname = ptr;
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*varval = NULL;
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ptr = find_name_end(ptr);
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if (*ptr && *ptr != '=')
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{
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*ptr = '\0';
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ptr = skip_space(ptr + 1);
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}
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if (*ptr == '=')
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{
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*ptr = '\0';
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ptr = skip_space(ptr + 1);
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if (*ptr)
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{
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*varval = ptr;
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ptr = find_value_end(ptr);
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*ptr = '\0';
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}
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}
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}
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static void parse_file(FILE *stream)
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{
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char *varname;
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char *varval;
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char *ptr;
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do
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{
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ptr = read_line(stream);
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if (ptr)
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{
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parse_line(ptr, &varname, &varval);
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if (varname)
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{
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if (!varval || strcmp(varval, "n") == 0)
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{
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printf("#undef %s\n", varname);
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}
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else if (strcmp(varval, "y") == 0)
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{
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printf("#define %s 1\n", varname);
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}
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else
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{
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printf("#define %s %s\n", varname, varval);
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}
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}
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}
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}
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while (ptr);
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}
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static inline char *getfilepath(const char *name)
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{
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snprintf(line, PATH_MAX, "%s/" DEFCONFIG, name);
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line[PATH_MAX] = '\0';
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return strdup(line);
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}
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static void show_usage(const char *progname)
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{
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fprintf(stderr, "USAGE: %s <abs path to .config>\n", progname);
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exit(1);
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}
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int main(int argc, char **argv, char **envp)
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{
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char *filepath;
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FILE *stream;
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if (argc != 2)
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{
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fprintf(stderr, "Unexpected number of arguments\n");
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show_usage(argv[0]);
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}
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filepath = getfilepath(argv[1]);
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if (!filepath)
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{
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fprintf(stderr, "getfilepath failed\n");
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exit(2);
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}
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stream= fopen(filepath, "r");
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if (!stream)
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{
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fprintf(stderr, "open %s failed: %s\n", filepath, strerror(errno));
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exit(3);
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}
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printf("/* config.h -- Autogenerated! Do not edit. */\n\n");
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printf("#ifndef __ARCH_CONFIG_H\n");
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printf("#define __ARCH_CONFIG_H\n\n");
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printf("/* Architecture-specific options *************************/\n\n");
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parse_file(stream);
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printf("\n/* Sanity Checks *****************************************/\n\n");
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printf("/* The correct way to disable RR scheduling is to set the\n");
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printf(" * timeslice to zero.\n");
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printf(" */\n\n");
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printf("#ifndef CONFIG_RR_INTERVAL\n");
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printf("# define CONFIG_RR_INTERVAL 0\n");
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printf("#endif\n\n");
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printf("/* The correct way to disable filesystem supuport is to set the\n");
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printf(" * number of file descriptors to zero.\n");
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printf(" */\n\n");
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printf("#ifndef CONFIG_NFILE_DESCRIPTORS\n");
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printf("# define CONFIG_NFILE_DESCRIPTORS 0\n");
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printf("#endif\n\n");
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printf("/* If a console is selected, then make sure that there are\n");
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printf(" * resources for 3 file descriptors and, if any streams are\n");
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printf(" * selected, also for 3 file streams.\n");
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printf(" */\n\n");
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printf("#ifdef CONFIG_DEV_CONSOLE\n");
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printf("# if CONFIG_NFILE_DESCRIPTORS < 3\n");
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printf("# undef CONFIG_NFILE_DESCRIPTORS\n");
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printf("# define CONFIG_NFILE_DESCRIPTORS 3\n");
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printf("# endif\n\n");
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printf("# if CONFIG_NFILE_STREAMS > 0 && CONFIG_NFILE_STREAMS < 3\n");
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printf("# undef CONFIG_NFILE_STREAMS\n");
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printf("# define CONFIG_NFILE_STREAMS 3\n");
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printf("# endif\n");
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printf("#endif\n\n");
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printf("/* If no file descriptors are configured, then make certain no\n");
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printf(" * streams are configured either.\n");
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printf(" */\n\n");
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printf("#if CONFIG_NFILE_DESCRIPTORS == 0\n");
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printf("# undef CONFIG_NFILE_STREAMS\n");
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printf("# define CONFIG_NFILE_STREAMS 0\n");
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printf("#endif\n\n");
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printf("/* There must be at least one memory region. */\n\n");
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printf("#ifndef CONFIG_MM_REGIONS\n");
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printf("# define CONFIG_MM_REGIONS 1\n");
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printf("#endif\n\n");
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printf("/* If no file streams are configured, then make certain that buffered I/O\n");
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printf(" * support is disabled\n");
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printf(" */\n\n");
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printf("#if CONFIG_NFILE_STREAMS == 0\n");
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printf("# undef CONFIG_STDIO_BUFFER_SIZE\n");
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printf("# define CONFIG_STDIO_BUFFER_SIZE 0\n");
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printf("#endif\n\n");
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printf("/* If mountpoint support in not included, then no filesystem can be supported */\n\n");
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printf("#ifdef CONFIG_DISABLE_MOUNTPOINT\n");
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printf("# undef CONFIG_FS_FAT\n");
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printf("#endif\n\n");
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printf("/* There can be no network support with no socket descriptors */\n\n");
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printf("#if CONFIG_NSOCKET_DESCRIPTORS <= 0\n");
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printf("# undef CONFIG_NET\n");
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printf("#endif\n\n");
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printf("/* Conversely, if there is no network support, there is no need for\n");
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printf(" * socket descriptors\n");
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printf(" */\n\n");
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printf("#ifndef CONFIG_NET\n");
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printf("# undef CONFIG_NSOCKET_DESCRIPTORS\n");
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printf("# define CONFIG_NSOCKET_DESCRIPTORS 0\n");
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printf("#endif\n\n");
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printf("/* Protocol support can only be provided on top of basic network support */\n\n");
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printf("#ifndef CONFIG_NET\n");
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printf("# undef CONFIG_NET_TCP\n");
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printf("# undef CONFIG_NET_UDP\n");
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printf("# undef CONFIG_NET_ICMP\n");
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printf("#endif\n\n");
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printf("/* Verbose debug only makes sense if debug is enabled */\n\n");
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printf("#ifndef CONFIG_DEBUG\n");
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printf("# undef CONFIG_DEBUG_VERBOSE\n");
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printf("#endif\n\n");
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printf("#endif /* __ARCH_CONFIG_H */\n");
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fclose(stream);
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return 0;
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}
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