scripts/basic/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, signed 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, signed char * line)     { line = line; adddep(file); }
 152 void noaction(char * line)                 { line = line; }
 153 void noaction2(char * file, signed 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                         signed char *p;
 183                         signed 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  * Document spåecific function(s) in a file.
 253  * Call kernel-doc with the following parameters:
 254  * kernel-doc -docbook -function function1 [-function function2]
 255  */
 256 void singfunc(char * filename, signed char * line)
 257 {
 258         char *vec[200]; /* Enough for specific functions */
 259         int i, idx = 0;
 260         int startofsym = 1;
 261         vec[idx++] = KERNELDOC;
 262         vec[idx++] = DOCBOOK;
 263
 264         /* Split line up in individual parameters preceeded by FUNCTION */
 265         for (i=0; line[i]; i++) {
 266                 if (isspace(line[i])) {
 267                         line[i] = '\0';
 268                         startofsym = 1;
 269                         continue;
 270                 }
 271                 if (startofsym) {
 272                         startofsym = 0;
 273                         vec[idx++] = FUNCTION;
 274                         vec[idx++] = &line[i];
 275                 }
 276         }
 277         vec[idx++] = filename;
 278         vec[idx] = NULL;
 279         exec_kernel_doc(vec);
 280 }
 281
 282 /*
 283  * Parse file, calling action specific functions for:
 284  * 1) Lines containing !E
 285  * 2) Lines containing !I
 286  * 3) Lines containing !D
 287  * 4) Lines containing !F
 288  * 5) Default lines - lines not matching the above
 289  */
 290 void parse_file(FILE *infile)
 291 {
 292         char line[MAXLINESZ];
 293         signed char * s;
 294         while(fgets(line, MAXLINESZ, infile)) {
 295                 if (line[0] == '!') {
 296                         s = line + 2;
 297                         switch (line[1]) {
 298                                 case 'E':
 299                                         while (*s && !isspace(*s)) s++;
 300                                         *s = '\0';
 301                                         externalfunctions(line+2);
 302                                         break;
 303                                 case 'I':
 304                                         while (*s && !isspace(*s)) s++;
 305                                         *s = '\0';
 306                                         internalfunctions(line+2);
 307                                         break;
 308                                 case 'D':
 309                                         while (*s && !isspace(*s)) s++;
 310                                         *s = '\0';
 311                                         symbolsonly(line+2);
 312                                         break;
 313                                 case 'F':
 314                                         /* filename */
 315                                         while (*s && !isspace(*s)) s++;
 316                                         *s++ = '\0';
 317                                         /* function names */
 318                                         while (isspace(*s))
 319                                                 s++;
 320                                         singlefunctions(line +2, s);
 321                                         break;
 322                                 default:
 323                                         defaultline(line);
 324                         }
 325                 }
 326                 else {
 327                         defaultline(line);
 328                 }
 329         }
 330         fflush(stdout);
 331 }
 332
 333
 334 int main(int argc, char *argv[])
 335 {
 336         FILE * infile;
 337         if (argc != 3) {
 338                 usage();
 339                 exit(1);
 340         }
 341         /* Open file, exit on error */
 342         infile = fopen(argv[2], "r");
 343         if (infile == NULL) {
 344                 fprintf(stderr, "docproc: ");
 345                 perror(argv[2]);
 346                 exit(2);
 347         }
 348
 349         if (strcmp("doc", argv[1]) == 0)
 350         {
 351                 /* Need to do this in two passes.
 352                  * First pass is used to collect all symbols exported
 353                  * in the various files.
 354                  * Second pass generate the documentation.
 355                  * This is required because function are declared
 356                  * and exported in different files :-((
 357                  */
 358                 /* Collect symbols */
 359                 defaultline       = noaction;
 360                 internalfunctions = find_export_symbols;
 361                 externalfunctions = find_export_symbols;
 362                 symbolsonly       = find_export_symbols;
 363                 singlefunctions   = noaction2;
 364                 parse_file(infile);
 365
 366                 /* Rewind to start from beginning of file again */
 367                 fseek(infile, 0, SEEK_SET);
 368                 defaultline       = printline;
 369                 internalfunctions = intfunc;
 370                 externalfunctions = extfunc;
 371                 symbolsonly       = printline;
 372                 singlefunctions   = singfunc;
 373
 374                 parse_file(infile);
 375         }
 376         else if (strcmp("depend", argv[1]) == 0)
 377         {
 378                 /* Create first part of dependency chain
 379                  * file.tmpl */
 380                 printf("%s\t", argv[2]);
 381                 defaultline       = noaction;
 382                 internalfunctions = adddep;
 383                 externalfunctions = adddep;
 384                 symbolsonly       = adddep;
 385                 singlefunctions   = adddep2;
 386                 parse_file(infile);
 387                 printf("\n");
 388         }
 389         else
 390         {
 391                 fprintf(stderr, "Unknown option: %s\n", argv[1]);
 392                 exit(1);
 393         }
 394         fclose(infile);
 395         fflush(stdout);
 396         return exitstatus;
 397 }
 398