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-/*
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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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-
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-#include <sys/stat.h>
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-#include <sys/types.h>
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-
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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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-
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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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-
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-
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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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-
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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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-
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- int buffer_size;
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-
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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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-
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- struct stat stat_buf;
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-
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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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-
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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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-
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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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-
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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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-
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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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-
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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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-
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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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-
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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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-
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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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-
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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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-
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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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- int c = (unsigned char) 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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-
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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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-
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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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-
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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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-
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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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- /*
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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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- /*
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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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-
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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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-
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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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-
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- /* First strip the \n. */
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- line[strlen(line)-1] = '\0';
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-
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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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-
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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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-
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- if (pclose(fp_find) != 0)
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- ERROR_EXIT("find");
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-
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- return 0;
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-}
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Roman Zippel