scripts/docproc.c

   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         /* Make sure output generated so far are flushed */
  83         fflush(stdout);
  84         switch(pid=fork()) {
  85                 case -1:
  86                         perror("fork");
  87                         exit(1);
  88                 case  0:
  89                         execvp(KERNELDOCPATH KERNELDOC, svec);
  90                         perror("exec " KERNELDOCPATH KERNELDOC);
  91                         exit(1);
  92                 default:
  93                         waitpid(pid, &ret ,0);
  94         }
  95         if (WIFEXITED(ret))
  96                 exitstatus |= WEXITSTATUS(ret);
  97         else
  98                 exitstatus = 0xff;
  99 }
 100
 101 /* Types used to create list of all exported symbols in a number of files */
 102 struct symbols
 103 {
 104         char *name;
 105 };
 106
 107 struct symfile
 108 {
 109         char *filename;
 110         struct symbols *symbollist;
 111         int symbolcnt;
 112 };
 113
 114 struct symfile symfilelist[MAXFILES];
 115 int symfilecnt = 0;
 116
 117 void add_new_symbol(struct symfile *sym, char * symname)
 118 {
 119         sym->symbollist =
 120           realloc(sym->symbollist, (sym->symbolcnt + 1) * sizeof(char *));
 121         sym->symbollist[sym->symbolcnt++].name = strdup(symname);
 122 }
 123
 124 /* Add a filename to the list */
 125 struct symfile * add_new_file(char * filename)
 126 {
 127         symfilelist[symfilecnt++].filename = strdup(filename);
 128         return &symfilelist[symfilecnt - 1];
 129 }
 130 /* Check if file already are present in the list */
 131 struct symfile * filename_exist(char * filename)
 132 {
 133         int i;
 134         for (i=0; i < symfilecnt; i++)
 135                 if (strcmp(symfilelist[i].filename, filename) == 0)
 136                         return &symfilelist[i];
 137         return NULL;
 138 }
 139
 140 /*
 141  * List all files referenced within the template file.
 142  * Files are separated by tabs.
 143  */
 144 void adddep(char * file)                   { printf("\t%s", file); }
 145 void adddep2(char * file, char * line)     { line = line; adddep(file); }
 146 void noaction(char * line)                 { line = line; }
 147 void noaction2(char * file, char * line)   { file = file; line = line; }
 148
 149 /* Echo the line without further action */
 150 void printline(char * line)               { printf("%s", line); }
 151
 152 /*
 153  * Find all symbols exported with EXPORT_SYMBOL and EXPORT_SYMBOL_GPL
 154  * in filename.
 155  * All symbols located are stored in symfilelist.
 156  */
 157 void find_export_symbols(char * filename)
 158 {
 159         FILE * fp;
 160         struct symfile *sym;
 161         char line[MAXLINESZ];
 162         if (filename_exist(filename) == NULL) {
 163                 sym = add_new_file(filename);
 164                 fp = fopen(filename, "r");
 165                 if (fp == NULL)
 166                 {
 167                         fprintf(stderr, "docproc: ");
 168                         perror(filename);
 169                 }
 170                 while(fgets(line, MAXLINESZ, fp)) {
 171                         char *p;
 172                         char *e;
 173                         if (((p = strstr(line, "EXPORT_SYMBOL_GPL")) != 0) ||
 174                             ((p = strstr(line, "EXPORT_SYMBOL")) != 0)) {
 175                                 /* Skip EXPORT_SYMBOL{_GPL} */
 176                                 while (isalnum(*p) || *p == '_')
 177                                         p++;
 178                                 /* Remove paranteses and additional ws */
 179                                 while (isspace(*p))
 180                                         p++;
 181                                 if (*p != '(')
 182                                         continue; /* Syntax error? */
 183                                 else
 184                                         p++;
 185                                 while (isspace(*p))
 186                                         p++;
 187                                 e = p;
 188                                 while (isalnum(*e) || *e == '_')
 189                                         e++;
 190                                 *e = '\0';
 191                                 add_new_symbol(sym, p);
 192                         }
 193                 }
 194                 fclose(fp);
 195         }
 196 }
 197
 198 /*
 199  * Document all external or internal functions in a file.
 200  * Call kernel-doc with following parameters:
 201  * kernel-doc -docbook -nofunction function_name1 filename
 202  * function names are obtained from all the the src files
 203  * by find_export_symbols.
 204  * intfunc uses -nofunction
 205  * extfunc uses -function
 206  */
 207 void docfunctions(char * filename, char * type)
 208 {
 209         int i,j;
 210         int symcnt = 0;
 211         int idx = 0;
 212         char **vec;
 213
 214         for (i=0; i <= symfilecnt; i++)
 215                 symcnt += symfilelist[i].symbolcnt;
 216         vec = malloc((2 + 2 * symcnt + 2) * sizeof(char*));
 217         if (vec == NULL) {
 218                 perror("docproc: ");
 219                 exit(1);
 220         }
 221         vec[idx++] = KERNELDOC;
 222         vec[idx++] = DOCBOOK;
 223         for (i=0; i < symfilecnt; i++) {
 224                 struct symfile * sym = &symfilelist[i];
 225                 for (j=0; j < sym->symbolcnt; j++) {
 226                         vec[idx++]     = type;
 227                         vec[idx++] = sym->symbollist[j].name;
 228                 }
 229         }
 230         vec[idx++]     = filename;
 231         vec[idx] = NULL;
 232         printf("<!-- %s -->\n", filename);
 233         exec_kernel_doc(vec);
 234         fflush(stdout);
 235         free(vec);
 236 }
 237 void intfunc(char * filename) { docfunctions(filename, NOFUNCTION); }
 238 void extfunc(char * filename) { docfunctions(filename, FUNCTION);   }
 239
 240 /*
 241  * Document spåecific function(s) in a file.
 242  * Call kernel-doc with the following parameters:
 243  * kernel-doc -docbook -function function1 [-function function2]
 244  */
 245 void singfunc(char * filename, char * line)
 246 {
 247         char *vec[200]; /* Enough for specific functions */
 248         int i, idx = 0;
 249         int startofsym = 1;
 250         vec[idx++] = KERNELDOC;
 251         vec[idx++] = DOCBOOK;
 252
 253         /* Split line up in individual parameters preceeded by FUNCTION */
 254         for (i=0; line[i]; i++) {
 255                 if (isspace(line[i])) {
 256                         line[i] = '\0';
 257                         startofsym = 1;
 258                         continue;
 259                 }
 260                 if (startofsym) {
 261                         startofsym = 0;
 262                         vec[idx++] = FUNCTION;
 263                         vec[idx++] = &line[i];
 264                 }
 265         }
 266         vec[idx++] = filename;
 267         vec[idx] = NULL;
 268         exec_kernel_doc(vec);
 269 }
 270
 271 /*
 272  * Parse file, calling action specific functions for:
 273  * 1) Lines containing !E
 274  * 2) Lines containing !I
 275  * 3) Lines containing !D
 276  * 4) Lines containing !F
 277  * 5) Default lines - lines not matching the above
 278  */
 279 void parse_file(FILE *infile)
 280 {
 281         char line[MAXLINESZ];
 282         char * s;
 283         while(fgets(line, MAXLINESZ, infile)) {
 284                 if (line[0] == '!') {
 285                         s = line + 2;
 286                         switch (line[1]) {
 287                                 case 'E':
 288                                         while (*s && !isspace(*s)) s++;
 289                                         *s = '\0';
 290                                         externalfunctions(line+2);
 291                                         break;
 292                                 case 'I':
 293                                         while (*s && !isspace(*s)) s++;
 294                                         *s = '\0';
 295                                         internalfunctions(line+2);
 296                                         break;
 297                                 case 'D':
 298                                         while (*s && !isspace(*s)) s++;
 299                                         *s = '\0';
 300                                         symbolsonly(line+2);
 301                                         break;
 302                                 case 'F':
 303                                         /* filename */
 304                                         while (*s && !isspace(*s)) s++;
 305                                         *s++ = '\0';
 306                                         /* function names */
 307                                         while (isspace(*s))
 308                                                 s++;
 309                                         singlefunctions(line +2, s);
 310                                         break;
 311                                 default:
 312                                         defaultline(line);
 313                         }
 314                 }
 315                 else {
 316                         defaultline(line);
 317                 }
 318         }
 319         fflush(stdout);
 320 }
 321
 322
 323 int main(int argc, char *argv[])
 324 {
 325         FILE * infile;
 326         if (argc != 3) {
 327                 usage();
 328                 exit(1);
 329         }
 330         /* Open file, exit on error */
 331         infile = fopen(argv[2], "r");
 332         if (infile == NULL) {
 333                 fprintf(stderr, "docproc: ");
 334                 perror(argv[2]);
 335                 exit(2);
 336         }
 337
 338         if (strcmp("doc", argv[1]) == 0)
 339         {
 340                 /* Need to do this in two passes.
 341                  * First pass is used to collect all symbols exported
 342                  * in the various files.
 343                  * Second pass generate the documentation.
 344                  * This is required because function are declared
 345                  * and exported in different files :-((
 346                  */
 347                 /* Collect symbols */
 348                 defaultline       = noaction;
 349                 internalfunctions = find_export_symbols;
 350                 externalfunctions = find_export_symbols;
 351                 symbolsonly       = find_export_symbols;
 352                 singlefunctions   = noaction2;
 353                 parse_file(infile);
 354
 355                 /* Rewind to start from beginning of file again */
 356                 fseek(infile, 0, SEEK_SET);
 357                 defaultline       = printline;
 358                 internalfunctions = intfunc;
 359                 externalfunctions = extfunc;
 360                 symbolsonly       = printline;
 361                 singlefunctions   = singfunc;
 362
 363                 parse_file(infile);
 364         }
 365         else if (strcmp("depend", argv[1]) == 0)
 366         {
 367                 /* Create first part of dependency chain
 368                  * file.tmpl */
 369                 printf("%s\t", argv[2]);
 370                 defaultline       = noaction;
 371                 internalfunctions = adddep;
 372                 externalfunctions = adddep;
 373                 symbolsonly       = adddep;
 374                 singlefunctions   = adddep2;
 375                 parse_file(infile);
 376                 printf("\n");
 377         }
 378         else
 379         {
 380                 fprintf(stderr, "Unknown option: %s\n", argv[1]);
 381                 exit(1);
 382         }
 383         fclose(infile);
 384         fflush(stdout);
 385         return exitstatus;
 386 }
 387