| 1 | /* |
| 2 | * docproc is a simple preprocessor for the template files |
| 3 | * used as placeholders for the kernel internal documentation. |
| 4 | * docproc is used for documentation-frontend and |
| 5 | * dependency-generator. |
| 6 | * The two usages have in common that they require |
| 7 | * some knowledge of the .tmpl syntax, therefore they |
| 8 | * are kept together. |
| 9 | * |
| 10 | * documentation-frontend |
| 11 | * Scans the template file and call kernel-doc for |
| 12 | * all occurrences of ![EIF]file |
| 13 | * Beforehand each referenced file are scanned for |
| 14 | * any exported sympols "EXPORT_SYMBOL()" statements. |
| 15 | * This is used to create proper -function and |
| 16 | * -nofunction arguments in calls to kernel-doc. |
| 17 | * Usage: docproc doc file.tmpl |
| 18 | * |
| 19 | * dependency-generator: |
| 20 | * Scans the template file and list all files |
| 21 | * referenced in a format recognized by make. |
| 22 | * Usage: docproc depend file.tmpl |
| 23 | * Writes dependency information to stdout |
| 24 | * in the following format: |
| 25 | * file.tmpl src.c src2.c |
| 26 | * The filenames are obtained from the following constructs: |
| 27 | * !Efilename |
| 28 | * !Ifilename |
| 29 | * !Dfilename |
| 30 | * !Ffilename |
| 31 | * |
| 32 | */ |
| 33 | |
| 34 | #include <stdio.h> |
| 35 | #include <stdlib.h> |
| 36 | #include <string.h> |
| 37 | #include <ctype.h> |
| 38 | #include <unistd.h> |
| 39 | #include <limits.h> |
| 40 | #include <sys/types.h> |
| 41 | #include <sys/wait.h> |
| 42 | |
| 43 | /* exitstatus is used to keep track of any failing calls to kernel-doc, |
| 44 | * but execution continues. */ |
| 45 | int exitstatus = 0; |
| 46 | |
| 47 | typedef void DFL(char *); |
| 48 | DFL *defaultline; |
| 49 | |
| 50 | typedef void FILEONLY(char * file); |
| 51 | FILEONLY *internalfunctions; |
| 52 | FILEONLY *externalfunctions; |
| 53 | FILEONLY *symbolsonly; |
| 54 | |
| 55 | typedef void FILELINE(char * file, char * line); |
| 56 | FILELINE * singlefunctions; |
| 57 | FILELINE * entity_system; |
| 58 | |
| 59 | #define MAXLINESZ 2048 |
| 60 | #define MAXFILES 250 |
| 61 | #define KERNELDOCPATH "scripts/" |
| 62 | #define KERNELDOC "kernel-doc" |
| 63 | #define DOCBOOK "-docbook" |
| 64 | #define FUNCTION "-function" |
| 65 | #define NOFUNCTION "-nofunction" |
| 66 | |
| 67 | void usage (void) |
| 68 | { |
| 69 | fprintf(stderr, "Usage: docproc {doc|depend} file\n"); |
| 70 | fprintf(stderr, "Input is read from file.tmpl. Output is sent to stdout\n"); |
| 71 | fprintf(stderr, "doc: frontend when generating kernel documentation\n"); |
| 72 | fprintf(stderr, "depend: generate list of files referenced within file\n"); |
| 73 | } |
| 74 | |
| 75 | /* |
| 76 | * Execute kernel-doc with parameters givin in svec |
| 77 | */ |
| 78 | void exec_kernel_doc(char **svec) |
| 79 | { |
| 80 | pid_t pid; |
| 81 | int ret; |
| 82 | char real_filename[PATH_MAX + 1]; |
| 83 | /* Make sure output generated so far are flushed */ |
| 84 | fflush(stdout); |
| 85 | switch(pid=fork()) { |
| 86 | case -1: |
| 87 | perror("fork"); |
| 88 | exit(1); |
| 89 | case 0: |
| 90 | memset(real_filename, 0, sizeof(real_filename)); |
| 91 | strncat(real_filename, getenv("SRCTREE"), PATH_MAX); |
| 92 | strncat(real_filename, KERNELDOCPATH KERNELDOC, |
| 93 | PATH_MAX - strlen(real_filename)); |
| 94 | execvp(real_filename, svec); |
| 95 | fprintf(stderr, "exec "); |
| 96 | perror(real_filename); |
| 97 | exit(1); |
| 98 | default: |
| 99 | waitpid(pid, &ret ,0); |
| 100 | } |
| 101 | if (WIFEXITED(ret)) |
| 102 | exitstatus |= WEXITSTATUS(ret); |
| 103 | else |
| 104 | exitstatus = 0xff; |
| 105 | } |
| 106 | |
| 107 | /* Types used to create list of all exported symbols in a number of files */ |
| 108 | struct symbols |
| 109 | { |
| 110 | char *name; |
| 111 | }; |
| 112 | |
| 113 | struct symfile |
| 114 | { |
| 115 | char *filename; |
| 116 | struct symbols *symbollist; |
| 117 | int symbolcnt; |
| 118 | }; |
| 119 | |
| 120 | struct symfile symfilelist[MAXFILES]; |
| 121 | int symfilecnt = 0; |
| 122 | |
| 123 | void add_new_symbol(struct symfile *sym, char * symname) |
| 124 | { |
| 125 | sym->symbollist = |
| 126 | realloc(sym->symbollist, (sym->symbolcnt + 1) * sizeof(char *)); |
| 127 | sym->symbollist[sym->symbolcnt++].name = strdup(symname); |
| 128 | } |
| 129 | |
| 130 | /* Add a filename to the list */ |
| 131 | struct symfile * add_new_file(char * filename) |
| 132 | { |
| 133 | symfilelist[symfilecnt++].filename = strdup(filename); |
| 134 | return &symfilelist[symfilecnt - 1]; |
| 135 | } |
| 136 | /* Check if file already are present in the list */ |
| 137 | struct symfile * filename_exist(char * filename) |
| 138 | { |
| 139 | int i; |
| 140 | for (i=0; i < symfilecnt; i++) |
| 141 | if (strcmp(symfilelist[i].filename, filename) == 0) |
| 142 | return &symfilelist[i]; |
| 143 | return NULL; |
| 144 | } |
| 145 | |
| 146 | /* |
| 147 | * List all files referenced within the template file. |
| 148 | * Files are separated by tabs. |
| 149 | */ |
| 150 | void adddep(char * file) { printf("\t%s", file); } |
| 151 | void adddep2(char * file, char * line) { line = line; adddep(file); } |
| 152 | void noaction(char * line) { line = line; } |
| 153 | void noaction2(char * file, char * line) { file = file; line = line; } |
| 154 | |
| 155 | /* Echo the line without further action */ |
| 156 | void printline(char * line) { printf("%s", line); } |
| 157 | |
| 158 | /* |
| 159 | * Find all symbols exported with EXPORT_SYMBOL and EXPORT_SYMBOL_GPL |
| 160 | * in filename. |
| 161 | * All symbols located are stored in symfilelist. |
| 162 | */ |
| 163 | void find_export_symbols(char * filename) |
| 164 | { |
| 165 | FILE * fp; |
| 166 | struct symfile *sym; |
| 167 | char line[MAXLINESZ]; |
| 168 | if (filename_exist(filename) == NULL) { |
| 169 | char real_filename[PATH_MAX + 1]; |
| 170 | memset(real_filename, 0, sizeof(real_filename)); |
| 171 | strncat(real_filename, getenv("SRCTREE"), PATH_MAX); |
| 172 | strncat(real_filename, filename, |
| 173 | PATH_MAX - strlen(real_filename)); |
| 174 | sym = add_new_file(filename); |
| 175 | fp = fopen(real_filename, "r"); |
| 176 | if (fp == NULL) |
| 177 | { |
| 178 | fprintf(stderr, "docproc: "); |
| 179 | perror(real_filename); |
| 180 | } |
| 181 | while(fgets(line, MAXLINESZ, fp)) { |
| 182 | char *p; |
| 183 | char *e; |
| 184 | if (((p = strstr(line, "EXPORT_SYMBOL_GPL")) != 0) || |
| 185 | ((p = strstr(line, "EXPORT_SYMBOL")) != 0)) { |
| 186 | /* Skip EXPORT_SYMBOL{_GPL} */ |
| 187 | while (isalnum(*p) || *p == '_') |
| 188 | p++; |
| 189 | /* Remove paranteses and additional ws */ |
| 190 | while (isspace(*p)) |
| 191 | p++; |
| 192 | if (*p != '(') |
| 193 | continue; /* Syntax error? */ |
| 194 | else |
| 195 | p++; |
| 196 | while (isspace(*p)) |
| 197 | p++; |
| 198 | e = p; |
| 199 | while (isalnum(*e) || *e == '_') |
| 200 | e++; |
| 201 | *e = '\0'; |
| 202 | add_new_symbol(sym, p); |
| 203 | } |
| 204 | } |
| 205 | fclose(fp); |
| 206 | } |
| 207 | } |
| 208 | |
| 209 | /* |
| 210 | * Document all external or internal functions in a file. |
| 211 | * Call kernel-doc with following parameters: |
| 212 | * kernel-doc -docbook -nofunction function_name1 filename |
| 213 | * function names are obtained from all the the src files |
| 214 | * by find_export_symbols. |
| 215 | * intfunc uses -nofunction |
| 216 | * extfunc uses -function |
| 217 | */ |
| 218 | void docfunctions(char * filename, char * type) |
| 219 | { |
| 220 | int i,j; |
| 221 | int symcnt = 0; |
| 222 | int idx = 0; |
| 223 | char **vec; |
| 224 | |
| 225 | for (i=0; i <= symfilecnt; i++) |
| 226 | symcnt += symfilelist[i].symbolcnt; |
| 227 | vec = malloc((2 + 2 * symcnt + 2) * sizeof(char*)); |
| 228 | if (vec == NULL) { |
| 229 | perror("docproc: "); |
| 230 | exit(1); |
| 231 | } |
| 232 | vec[idx++] = KERNELDOC; |
| 233 | vec[idx++] = DOCBOOK; |
| 234 | for (i=0; i < symfilecnt; i++) { |
| 235 | struct symfile * sym = &symfilelist[i]; |
| 236 | for (j=0; j < sym->symbolcnt; j++) { |
| 237 | vec[idx++] = type; |
| 238 | vec[idx++] = sym->symbollist[j].name; |
| 239 | } |
| 240 | } |
| 241 | vec[idx++] = filename; |
| 242 | vec[idx] = NULL; |
| 243 | printf("<!-- %s -->\n", filename); |
| 244 | exec_kernel_doc(vec); |
| 245 | fflush(stdout); |
| 246 | free(vec); |
| 247 | } |
| 248 | void intfunc(char * filename) { docfunctions(filename, NOFUNCTION); } |
| 249 | void extfunc(char * filename) { docfunctions(filename, FUNCTION); } |
| 250 | |
| 251 | /* |
| 252 |