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