4 * Copyright abandoned, Michael Chastain, <mailto:mec@shout.net>.
5 * This is a C version of syncdep.pl by Werner Almesberger.
7 * This program takes autoconf.h as input and outputs a directory full
8 * of one-line include files, merging onto the old values.
10 * Think of the configuration options as key-value pairs. Then there
13 * key old value new value action
15 * KEY-1 VALUE-1 VALUE-1 leave file alone
16 * KEY-2 VALUE-2A VALUE-2B write VALUE-2B into file
17 * KEY-3 - VALUE-3 write VALUE-3 into file
18 * KEY-4 VALUE-4 - write an empty file
19 * KEY-5 (empty) - leave old empty file alone
23 #include <sys/types.h>
33 #define ERROR_EXIT(strExit) \
35 const int errnoSave = errno; \
36 fprintf(stderr, "%s: ", str_my_name); \
44 int main(int argc
, const char * argv
[])
46 const char * str_my_name
;
47 const char * str_file_autoconf
;
48 const char * str_dir_config
;
63 /* Check arg count. */
66 fprintf(stderr
, "%s: wrong number of arguments.\n", argv
[0]);
70 str_my_name
= argv
[0];
71 str_file_autoconf
= argv
[1];
72 str_dir_config
= argv
[2];
74 /* Find a buffer size. */
75 if (stat(str_file_autoconf
, &stat_buf
) != 0)
76 ERROR_EXIT(str_file_autoconf
);
77 buffer_size
= 2 * stat_buf
.st_size
+ 4096;
79 /* Allocate buffers. */
80 if ( (line
= malloc(buffer_size
)) == NULL
81 || (old_line
= malloc(buffer_size
)) == NULL
82 || (list_target
= malloc(buffer_size
)) == NULL
)
83 ERROR_EXIT(str_file_autoconf
);
85 /* Open autoconfig file. */
86 if ((fp_config
= fopen(str_file_autoconf
, "r")) == NULL
)
87 ERROR_EXIT(str_file_autoconf
);
89 /* Make output directory if needed. */
90 if (stat(str_dir_config
, &stat_buf
) != 0)
92 if (mkdir(str_dir_config
, 0755) != 0)
93 ERROR_EXIT(str_dir_config
);
96 /* Change to output directory. */
97 if (chdir(str_dir_config
) != 0)
98 ERROR_EXIT(str_dir_config
);
100 /* Put initial separator into target list. */
101 ptarget
= list_target
;
104 /* Read config lines. */
105 while (fgets(line
, buffer_size
, fp_config
))
107 const signed char * str_config
;
113 if ((str_config
= strstr(line
, "CONFIG_")) == NULL
)
116 /* Make the output file name. */
117 str_config
+= sizeof("CONFIG_") - 1;
118 for (itarget
= 0; !isspace(str_config
[itarget
]); itarget
++)
120 int c
= (unsigned char) str_config
[itarget
];
121 if (isupper(c
)) c
= tolower(c
);
122 if (c
== '_') c
= '/';
123 ptarget
[itarget
] = c
;
125 ptarget
[itarget
++] = '.';
126 ptarget
[itarget
++] = 'h';
127 ptarget
[itarget
++] = '\0';
129 /* Check for existing file. */
131 if ((fp_target
= fopen(ptarget
, "r")) != NULL
)
133 fgets(old_line
, buffer_size
, fp_target
);
134 if (fclose(fp_target
) != 0)
136 if (!strcmp(line
, old_line
))
142 /* Auto-create directories. */
144 for (islash
= 0; islash
< itarget
; islash
++)
146 if (ptarget
[islash
] == '/')
148 ptarget
[islash
] = '\0';
149 if (stat(ptarget
, &stat_buf
) != 0
150 && mkdir(ptarget
, 0755) != 0)
151 ERROR_EXIT( ptarget
);
152 ptarget
[islash
] = '/';
156 /* Write the file. */
157 if ((fp_target
= fopen(ptarget
, "w" )) == NULL
)
159 fputs(line
, fp_target
);
160 if (ferror(fp_target
) || fclose(fp_target
) != 0)
164 /* Update target list */
170 * Close autoconfig file.
171 * Terminate the target list.
173 if (fclose(fp_config
) != 0)
174 ERROR_EXIT(str_file_autoconf
);
178 * Fix up existing files which have no new value.
179 * This is Case 4 and Case 5.
181 * I re-read the tree and filter it against list_target.
182 * This is crude. But it avoids data copies. Also, list_target
183 * is compact and contiguous, so it easily fits into cache.
185 * Notice that list_target contains strings separated by \n,
186 * with a \n before the first string and after the last.
187 * fgets gives the incoming names a terminating \n.
188 * So by having an initial \n, strstr will find exact matches.
191 fp_find
= popen("find * -type f -name \"*.h\" -print", "r");
193 ERROR_EXIT( "find" );
196 while (fgets(line
+1, buffer_size
, fp_find
))
198 if (strstr(list_target
, line
) == NULL
)
201 * This is an old file with no CONFIG_* flag in autoconf.h.
204 /* First strip the \n. */
205 line
[strlen(line
)-1] = '\0';
208 if (stat(line
+1, &stat_buf
) != 0)
211 /* If file is not empty, make it empty and give it a fresh date. */
212 if (stat_buf
.st_size
!= 0)
214 if ((fp_target
= fopen(line
+1, "w")) == NULL
)
216 if (fclose(fp_target
) != 0)
222 if (pclose(fp_find
) != 0)