[1765] | 1 | /*
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| 2 | * split-include.c
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| 3 | *
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| 4 | * Copyright abandoned, Michael Chastain, <mailto:mec@shout.net>.
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| 5 | * This is a C version of syncdep.pl by Werner Almesberger.
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| 6 | *
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| 7 | * This program takes autoconf.h as input and outputs a directory full
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| 8 | * of one-line include files, merging onto the old values.
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| 9 | *
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| 10 | * Think of the configuration options as key-value pairs. Then there
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| 11 | * are five cases:
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| 12 | *
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| 13 | * key old value new value action
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| 14 | *
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| 15 | * KEY-1 VALUE-1 VALUE-1 leave file alone
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| 16 | * KEY-2 VALUE-2A VALUE-2B write VALUE-2B into file
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| 17 | * KEY-3 - VALUE-3 write VALUE-3 into file
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| 18 | * KEY-4 VALUE-4 - write an empty file
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| 19 | * KEY-5 (empty) - leave old empty file alone
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| 20 | */
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| 21 |
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| 22 | #include <sys/stat.h>
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| 23 | #include <sys/types.h>
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| 24 |
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| 25 | #include <ctype.h>
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| 26 | #include <errno.h>
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| 27 | #include <fcntl.h>
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| 28 | #include <stdio.h>
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| 29 | #include <stdlib.h>
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| 30 | #include <string.h>
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| 31 | #include <unistd.h>
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| 32 |
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| 33 | #define ERROR_EXIT(strExit) \
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| 34 | { \
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| 35 | const int errnoSave = errno; \
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| 36 | fprintf(stderr, "%s: ", str_my_name); \
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| 37 | errno = errnoSave; \
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| 38 | perror((strExit)); \
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| 39 | exit(1); \
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| 40 | }
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| 41 |
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| 42 |
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| 43 |
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| 44 | int main(int argc, const char * argv [])
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| 45 | {
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| 46 | const char * str_my_name;
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| 47 | const char * str_file_autoconf;
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| 48 | const char * str_dir_config;
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| 49 |
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| 50 | FILE * fp_config;
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| 51 | FILE * fp_target;
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| 52 | FILE * fp_find;
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| 53 |
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| 54 | int buffer_size;
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| 55 |
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| 56 | char * line;
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| 57 | char * old_line;
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| 58 | char * list_target;
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| 59 | char * ptarget;
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| 60 |
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| 61 | struct stat stat_buf;
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| 62 |
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| 63 | /* Check arg count. */
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| 64 | if (argc != 3)
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| 65 | {
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| 66 | fprintf(stderr, "%s: wrong number of arguments.\n", argv[0]);
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| 67 | exit(1);
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| 68 | }
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| 69 |
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| 70 | str_my_name = argv[0];
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| 71 | str_file_autoconf = argv[1];
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| 72 | str_dir_config = argv[2];
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| 73 |
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| 74 | /* Find a buffer size. */
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| 75 | if (stat(str_file_autoconf, &stat_buf) != 0)
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| 76 | ERROR_EXIT(str_file_autoconf);
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| 77 | buffer_size = 2 * stat_buf.st_size + 4096;
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| 78 |
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| 79 | /* Allocate buffers. */
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| 80 | if ( (line = malloc(buffer_size)) == NULL
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| 81 | || (old_line = malloc(buffer_size)) == NULL
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| 82 | || (list_target = malloc(buffer_size)) == NULL )
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| 83 | ERROR_EXIT(str_file_autoconf);
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| 84 |
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| 85 | /* Open autoconfig file. */
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| 86 | if ((fp_config = fopen(str_file_autoconf, "r")) == NULL)
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| 87 | ERROR_EXIT(str_file_autoconf);
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| 88 |
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| 89 | /* Make output directory if needed. */
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| 90 | if (stat(str_dir_config, &stat_buf) != 0)
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| 91 | {
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| 92 | if (mkdir(str_dir_config, 0755) != 0)
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| 93 | ERROR_EXIT(str_dir_config);
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| 94 | }
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| 95 |
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| 96 | /* Change to output directory. */
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| 97 | if (chdir(str_dir_config) != 0)
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| 98 | ERROR_EXIT(str_dir_config);
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| 99 |
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| 100 | /* Put initial separator into target list. */
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| 101 | ptarget = list_target;
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| 102 | *ptarget++ = '\n';
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| 103 |
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| 104 | /* Read config lines. */
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| 105 | while (fgets(line, buffer_size, fp_config))
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| 106 | {
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| 107 | const char * str_config;
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| 108 | int is_same;
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| 109 | int itarget;
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| 110 |
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| 111 | if (line[0] != '#')
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| 112 | continue;
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| 113 | if ((str_config = strstr(line, "CONFIG_")) == NULL)
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| 114 | continue;
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| 115 |
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| 116 | /* Make the output file name. */
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| 117 | str_config += sizeof("CONFIG_") - 1;
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| 118 | for (itarget = 0; !isspace(str_config[itarget]); itarget++)
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| 119 | {
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| 120 | int c = (unsigned char) str_config[itarget];
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| 121 | if (isupper(c)) c = tolower(c);
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| 122 | if (c == '_') c = '/';
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| 123 | ptarget[itarget] = c;
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| 124 | }
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| 125 | ptarget[itarget++] = '.';
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| 126 | ptarget[itarget++] = 'h';
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| 127 | ptarget[itarget++] = '\0';
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| 128 |
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| 129 | /* Check for existing file. */
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| 130 | is_same = 0;
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| 131 | if ((fp_target = fopen(ptarget, "r")) != NULL)
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| 132 | {
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| 133 | fgets(old_line, buffer_size, fp_target);
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| 134 | if (fclose(fp_target) != 0)
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| 135 | ERROR_EXIT(ptarget);
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| 136 | if (!strcmp(line, old_line))
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| 137 | is_same = 1;
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| 138 | }
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| 139 |
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| 140 | if (!is_same)
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| 141 | {
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| 142 | /* Auto-create directories. */
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| 143 | int islash;
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| 144 | for (islash = 0; islash < itarget; islash++)
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| 145 | {
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| 146 | if (ptarget[islash] == '/')
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| 147 | {
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| 148 | ptarget[islash] = '\0';
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| 149 | if (stat(ptarget, &stat_buf) != 0
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| 150 | && mkdir(ptarget, 0755) != 0)
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| 151 | ERROR_EXIT( ptarget );
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| 152 | ptarget[islash] = '/';
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| 153 | }
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| 154 | }
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| 155 |
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| 156 | /* Write the file. */
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| 157 | if ((fp_target = fopen(ptarget, "w" )) == NULL)
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| 158 | ERROR_EXIT(ptarget);
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| 159 | fputs(line, fp_target);
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| 160 | if (ferror(fp_target) || fclose(fp_target) != 0)
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| 161 | ERROR_EXIT(ptarget);
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| 162 | }
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| 163 |
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| 164 | /* Update target list */
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| 165 | ptarget += itarget;
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| 166 | *(ptarget-1) = '\n';
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| 167 | }
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| 168 |
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| 169 | /*
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| 170 | * Close autoconfig file.
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| 171 | * Terminate the target list.
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| 172 | */
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| 173 | if (fclose(fp_config) != 0)
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| 174 | ERROR_EXIT(str_file_autoconf);
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| 175 | *ptarget = '\0';
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| 176 |
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| 177 | /*
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| 178 | * Fix up existing files which have no new value.
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| 179 | * This is Case 4 and Case 5.
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| 180 | *
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| 181 | * I re-read the tree and filter it against list_target.
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| 182 | * This is crude. But it avoids data copies. Also, list_target
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| 183 | * is compact and contiguous, so it easily fits into cache.
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| 184 | *
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| 185 | * Notice that list_target contains strings separated by \n,
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| 186 | * with a \n before the first string and after the last.
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| 187 | * fgets gives the incoming names a terminating \n.
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| 188 | * So by having an initial \n, strstr will find exact matches.
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| 189 | */
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| 190 |
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| 191 | fp_find = popen("find * -type f -name \"*.h\" -print", "r");
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| 192 | if (fp_find == 0)
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| 193 | ERROR_EXIT( "find" );
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| 194 |
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| 195 | line[0] = '\n';
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| 196 | while (fgets(line+1, buffer_size, fp_find))
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| 197 | {
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| 198 | if (strstr(list_target, line) == NULL)
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| 199 | {
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| 200 | /*
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| 201 | * This is an old file with no CONFIG_* flag in autoconf.h.
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| 202 | */
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| 203 |
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| 204 | /* First strip the \n. */
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| 205 | line[strlen(line)-1] = '\0';
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| 206 |
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| 207 | /* Grab size. */
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| 208 | if (stat(line+1, &stat_buf) != 0)
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| 209 | ERROR_EXIT(line);
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| 210 |
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| 211 | /* If file is not empty, make it empty and give it a fresh date. */
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| 212 | if (stat_buf.st_size != 0)
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| 213 | {
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| 214 | if ((fp_target = fopen(line+1, "w")) == NULL)
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| 215 | ERROR_EXIT(line);
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| 216 | if (fclose(fp_target) != 0)
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| 217 | ERROR_EXIT(line);
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| 218 | }
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| 219 | }
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| 220 | }
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| 221 |
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| 222 | if (pclose(fp_find) != 0)
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| 223 | ERROR_EXIT("find");
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| 224 |
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| 225 | return 0;
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| 226 | }
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