mirror of
https://github.com/sheumann/hush.git
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227 lines
5.4 KiB
C
227 lines
5.4 KiB
C
/*
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* split-include.c
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*
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* Copyright abandoned, Michael Chastain, <mailto:mec@shout.net>.
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* This is a C version of syncdep.pl by Werner Almesberger.
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*
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* This program takes autoconf.h as input and outputs a directory full
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* of one-line include files, merging onto the old values.
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*
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* Think of the configuration options as key-value pairs. Then there
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* are five cases:
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*
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* key old value new value action
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*
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* KEY-1 VALUE-1 VALUE-1 leave file alone
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* KEY-2 VALUE-2A VALUE-2B write VALUE-2B into file
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* KEY-3 - VALUE-3 write VALUE-3 into file
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* KEY-4 VALUE-4 - write an empty file
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* KEY-5 (empty) - leave old empty file alone
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*/
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <ctype.h>
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#include <errno.h>
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#include <fcntl.h>
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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 <unistd.h>
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#define ERROR_EXIT(strExit) \
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{ \
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const int errnoSave = errno; \
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fprintf(stderr, "%s: ", str_my_name); \
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errno = errnoSave; \
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perror((strExit)); \
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exit(1); \
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}
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int main(int argc, const char * argv [])
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{
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const char * str_my_name;
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const char * str_file_autoconf;
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const char * str_dir_config;
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FILE * fp_config;
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FILE * fp_target;
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FILE * fp_find;
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int buffer_size;
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char * line;
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char * old_line;
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char * list_target;
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char * ptarget;
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struct stat stat_buf;
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/* Check arg count. */
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if (argc != 3)
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{
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fprintf(stderr, "%s: wrong number of arguments.\n", argv[0]);
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exit(1);
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}
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str_my_name = argv[0];
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str_file_autoconf = argv[1];
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str_dir_config = argv[2];
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/* Find a buffer size. */
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if (stat(str_file_autoconf, &stat_buf) != 0)
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ERROR_EXIT(str_file_autoconf);
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buffer_size = 2 * stat_buf.st_size + 4096;
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/* Allocate buffers. */
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if ( (line = malloc(buffer_size)) == NULL
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|| (old_line = malloc(buffer_size)) == NULL
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|| (list_target = malloc(buffer_size)) == NULL )
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ERROR_EXIT(str_file_autoconf);
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/* Open autoconfig file. */
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if ((fp_config = fopen(str_file_autoconf, "r")) == NULL)
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ERROR_EXIT(str_file_autoconf);
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/* Make output directory if needed. */
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if (stat(str_dir_config, &stat_buf) != 0)
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{
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if (mkdir(str_dir_config, 0755) != 0)
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ERROR_EXIT(str_dir_config);
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}
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/* Change to output directory. */
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if (chdir(str_dir_config) != 0)
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ERROR_EXIT(str_dir_config);
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/* Put initial separator into target list. */
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ptarget = list_target;
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*ptarget++ = '\n';
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/* Read config lines. */
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while (fgets(line, buffer_size, fp_config))
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{
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const char * str_config;
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int is_same;
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int itarget;
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if (line[0] != '#')
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continue;
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if ((str_config = strstr(line, "CONFIG_")) == NULL)
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continue;
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/* Make the output file name. */
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str_config += sizeof("CONFIG_") - 1;
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for (itarget = 0; !isspace(str_config[itarget]); itarget++)
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{
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char c = str_config[itarget];
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if (isupper(c)) c = tolower(c);
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if (c == '_') c = '/';
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ptarget[itarget] = c;
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}
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ptarget[itarget++] = '.';
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ptarget[itarget++] = 'h';
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ptarget[itarget++] = '\0';
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/* Check for existing file. */
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is_same = 0;
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if ((fp_target = fopen(ptarget, "r")) != NULL)
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{
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fgets(old_line, buffer_size, fp_target);
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if (fclose(fp_target) != 0)
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ERROR_EXIT(ptarget);
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if (!strcmp(line, old_line))
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is_same = 1;
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}
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if (!is_same)
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{
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/* Auto-create directories. */
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int islash;
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for (islash = 0; islash < itarget; islash++)
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{
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if (ptarget[islash] == '/')
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{
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ptarget[islash] = '\0';
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if (stat(ptarget, &stat_buf) != 0
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&& mkdir(ptarget, 0755) != 0)
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ERROR_EXIT( ptarget );
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ptarget[islash] = '/';
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}
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}
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/* Write the file. */
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if ((fp_target = fopen(ptarget, "w" )) == NULL)
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ERROR_EXIT(ptarget);
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fputs(line, fp_target);
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if (ferror(fp_target) || fclose(fp_target) != 0)
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ERROR_EXIT(ptarget);
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}
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/* Update target list */
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ptarget += itarget;
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*(ptarget-1) = '\n';
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}
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/*
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* Close autoconfig file.
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* Terminate the target list.
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*/
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if (fclose(fp_config) != 0)
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ERROR_EXIT(str_file_autoconf);
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*ptarget = '\0';
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/*
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* Fix up existing files which have no new value.
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* This is Case 4 and Case 5.
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*
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* I re-read the tree and filter it against list_target.
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* This is crude. But it avoids data copies. Also, list_target
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* is compact and contiguous, so it easily fits into cache.
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*
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* Notice that list_target contains strings separated by \n,
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* with a \n before the first string and after the last.
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* fgets gives the incoming names a terminating \n.
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* So by having an initial \n, strstr will find exact matches.
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*/
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fp_find = popen("find * -type f -name \"*.h\" -print", "r");
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if (fp_find == 0)
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ERROR_EXIT( "find" );
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line[0] = '\n';
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while (fgets(line+1, buffer_size, fp_find))
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{
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if (strstr(list_target, line) == NULL)
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{
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/*
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* This is an old file with no CONFIG_* flag in autoconf.h.
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*/
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/* First strip the \n. */
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line[strlen(line)-1] = '\0';
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/* Grab size. */
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if (stat(line+1, &stat_buf) != 0)
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ERROR_EXIT(line);
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/* If file is not empty, make it empty and give it a fresh date. */
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if (stat_buf.st_size != 0)
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{
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if ((fp_target = fopen(line+1, "w")) == NULL)
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ERROR_EXIT(line);
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if (fclose(fp_target) != 0)
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ERROR_EXIT(line);
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}
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}
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}
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if (pclose(fp_find) != 0)
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ERROR_EXIT("find");
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return 0;
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}
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