release/src/router/busybox/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 #include <alloca.h>
  43
  44 /* exitstatus is used to keep track of any failing calls to kernel-doc,
  45  * but execution continues. */
  46 int exitstatus = 0;
  47
  48 typedef void DFL(char *);
  49 DFL *defaultline;
  50
  51 typedef void FILEONLY(char * file);
  52 FILEONLY *internalfunctions;
  53 FILEONLY *externalfunctions;
  54 FILEONLY *symbolsonly;
  55
  56 typedef void FILELINE(char * file, char * line);
  57 FILELINE * singlefunctions;
  58 FILELINE * entity_system;
  59
  60 #define MAXLINESZ     2048
  61 #define MAXFILES      250
  62 #define KERNELDOCPATH "scripts/"
  63 #define KERNELDOC     "kernel-doc"
  64 #define DOCBOOK       "-docbook"
  65 #define FUNCTION      "-function"
  66 #define NOFUNCTION    "-nofunction"
  67
  68 void usage (void)
  69 {
  70         fprintf(stderr, "Usage: docproc {doc|depend} file\n");
  71         fprintf(stderr, "Input is read from file.tmpl. Output is sent to stdout\n");
  72         fprintf(stderr, "doc: frontend when generating kernel documentation\n");
  73         fprintf(stderr, "depend: generate list of files referenced within file\n");
  74 }
  75
  76 /*
  77  * Execute kernel-doc with parameters givin in svec
  78  */
  79 void exec_kernel_doc(char **svec)
  80 {
  81         pid_t pid;
  82         int ret;
  83         char *real_filename;
  84         int rflen;
  85
  86         /* Make sure output generated so far are flushed */
  87         fflush(stdout);
  88         switch(pid=fork()) {
  89                 case -1:
  90                         perror("vfork"+1);
  91                         exit(1);
  92                 case  0:
  93                         rflen  = strlen(getenv("SRCTREE"));
  94                         rflen += strlen(KERNELDOCPATH KERNELDOC);
  95                         real_filename = alloca(rflen + 1);
  96                         strcpy(real_filename, getenv("SRCTREE"));
  97                         strcat(real_filename, KERNELDOCPATH KERNELDOC);
  98                         execvp(real_filename, svec);
  99                         fprintf(stderr, "exec ");
 100                         perror(real_filename);
 101                         exit(1);
 102                 default:
 103                         waitpid(pid, &ret ,0);
 104         }
 105         if (WIFEXITED(ret))
 106                 exitstatus |= WEXITSTATUS(ret);
 107         else
 108                 exitstatus = 0xff;
 109 }
 110
 111 /* Types used to create list of all exported symbols in a number of files */
 112 struct symbols
 113 {
 114         char *name;
 115 };
 116
 117 struct symfile
 118 {
 119         char *filename;
 120         struct symbols *symbollist;
 121         int symbolcnt;
 122 };
 123
 124 struct symfile symfilelist[MAXFILES];
 125 int symfilecnt = 0;
 126
 127 void add_new_symbol(struct symfile *sym, char * symname)
 128 {
 129         sym->symbollist =
 130           realloc(sym->symbollist, (sym->symbolcnt + 1) * sizeof(char *));
 131         sym->symbollist[sym->symbolcnt++].name = strdup(symname);
 132 }
 133
 134 /* Add a filename to the list */
 135 struct symfile * add_new_file(char * filename)
 136 {
 137         symfilelist[symfilecnt++].filename = strdup(filename);
 138         return &symfilelist[symfilecnt - 1];
 139 }
 140 /* Check if file already are present in the list */
 141 struct symfile * filename_exist(char * filename)
 142 {
 143         int i;
 144         for (i=0; i < symfilecnt; i++)
 145                 if (strcmp(symfilelist[i].filename, filename) == 0)
 146                         return &symfilelist[i];
 147         return NULL;
 148 }
 149
 150 /*
 151  * List all files referenced within the template file.
 152  * Files are separated by tabs.
 153  */
 154 void adddep(char * file)                   { printf("\t%s", file); }
 155 void adddep2(char * file, char * line)     { line = line; adddep(file); }
 156 void noaction(char * line)                 { line = line; }
 157 void noaction2(char * file, char * line)   { file = file; line = line; }
 158
 159 /* Echo the line without further action */
 160 void printline(char * line)               { printf("%s", line); }
 161
 162 /*
 163  * Find all symbols exported with EXPORT_SYMBOL and EXPORT_SYMBOL_GPL
 164  * in filename.
 165  * All symbols located are stored in symfilelist.
 166  */
 167 void find_export_symbols(char * filename)
 168 {
 169         FILE * fp;
 170         struct symfile *sym;
 171         char line[MAXLINESZ];
 172         if (filename_exist(filename) == NULL) {
 173                 int rflen = strlen(getenv("SRCTREE")) + strlen(filename);
 174                 char *real_filename = alloca(rflen + 1);
 175                 strcpy(real_filename, getenv("SRCTREE"));
 176                 strcat(real_filename, filename);
 177                 sym = add_new_file(filename);
 178                 fp = fopen(real_filename, "r");
 179                 if (fp == NULL)
 180                 {
 181                         fprintf(stderr, "docproc: ");
 182                         perror(real_filename);
 183                 }
 184                 while (fgets(line, MAXLINESZ, fp)) {
 185                         char *p;
 186                         char *e;
 187                         if (((p = strstr(line, "EXPORT_SYMBOL_GPL")) != 0) ||
 188                             ((p = strstr(line, "EXPORT_SYMBOL")) != 0)) {
 189                                 /* Skip EXPORT_SYMBOL{_GPL} */
 190                                 while (isalnum(*p) || *p == '_')
 191                                         p++;
 192                                 /* Remove paranteses and additional ws */
 193                                 while (isspace(*p))
 194                                         p++;
 195                                 if (*p != '(')
 196                                         continue; /* Syntax error? */
 197                                 else
 198                                         p++;
 199                                 while (isspace(*p))
 200                                         p++;
 201                                 e = p;
 202                                 while (isalnum(*e) || *e == '_')
 203                                         e++;
 204                                 *e = '\0';
 205                                 add_new_symbol(sym, p);
 206                         }
 207                 }
 208                 fclose(fp);
 209         }
 210 }
 211
 212 /*
 213  * Document all external or internal functions in a file.
 214  * Call kernel-doc with following parameters:
 215  * kernel-doc -docbook -nofunction function_name1 filename
 216  * function names are obtained from all the src files
 217  * by find_export_symbols.
 218  * intfunc uses -nofunction
 219  * extfunc uses -function
 220  */
 221 void docfunctions(char * filename, char * type)
 222 {
 223         int i,j;
 224         int symcnt = 0;
 225         int idx = 0;
 226         char **vec;
 227
 228         for (i=0; i <= symfilecnt; i++)
 229                 symcnt += symfilelist[i].symbolcnt;
 230         vec = malloc((2 + 2 * symcnt + 2) * sizeof(char*));
 231         if (vec == NULL) {
 232                 perror("docproc: ");
 233                 exit(1);
 234         }
 235         vec[idx++] = KERNELDOC;
 236         vec[idx++] = DOCBOOK;
 237         for (i=0; i < symfilecnt; i++) {
 238                 struct symfile * sym = &symfilelist[i];
 239                 for (j=0; j < sym->symbolcnt; j++) {
 240                         vec[idx++]     = type;
 241                         vec[idx++] = sym->symbollist[j].name;
 242                 }
 243         }
 244         vec[idx++]     = filename;
 245         vec[idx] = NULL;
 246         printf("<!-- %s -->\n", filename);
 247         exec_kernel_doc(vec);
 248         fflush(stdout);
 249         free(vec);
 250 }
 251 void intfunc(char * filename) { docfunctions(filename, NOFUNCTION); }
 252 void extfunc(char * filename) { docfunctions(filename, FUNCTION);   }
 253
 254 /*
 255  * Document specific function(s) in a file.
 256  * Call kernel-doc with the following parameters:
 257  * kernel-doc -docbook -function function1 [-function function2]
 258  */
 259 void singfunc(char * filename, char * line)
 260 {
 261         char *vec[200]; /* Enough for specific functions */
 262         int i, idx = 0;
 263         int startofsym = 1;
 264         vec[idx++] = KERNELDOC;
 265         vec[idx++] = DOCBOOK;
 266
 267         /* Split line up in individual parameters preceeded by FUNCTION */
 268         for (i=0; line[i]; i++) {
 269                 if (isspace(line[i])) {
 270                         line[i] = '\0';
 271                         startofsym = 1;
 272                         continue;
 273                 }
 274                 if (startofsym) {
 275                         startofsym = 0;
 276                         vec[idx++] = FUNCTION;
 277                         vec[idx++] = &line[i];
 278                 }
 279         }
 280         vec[idx++] = filename;
 281         vec[idx] = NULL;
 282         exec_kernel_doc(vec);
 283 }
 284
 285 /*
 286  * Parse file, calling action specific functions for:
 287  * 1) Lines containing !E
 288  * 2) Lines containing !I
 289  * 3) Lines containing !D
 290  * 4) Lines containing !F
 291  * 5) Default lines - lines not matching the above
 292  */
 293 void parse_file(FILE *infile)
 294 {
 295         char line[MAXLINESZ];
 296         char * s;
 297         while (fgets(line, MAXLINESZ, infile)) {
 298                 if (line[0] == '!') {
 299                         s = line + 2;
 300                         switch (line[1]) {
 301                                 case 'E':
 302                                         while (*s && !isspace(*s)) s++;
 303                                         *s = '\0';
 304                                         externalfunctions(line+2);
 305                                         break;
 306                                 case 'I':
 307                                         while (*s && !isspace(*s)) s++;
 308                                         *s = '\0';
 309                                         internalfunctions(line+2);
 310                                         break;
 311                                 case 'D':
 312                                         while (*s && !isspace(*s)) s++;
 313                                         *s = '\0';
 314                                         symbolsonly(line+2);
 315                                         break;
 316                                 case 'F':
 317                                         /* filename */
 318                                         while (*s && !isspace(*s)) s++;
 319                                         *s++ = '\0';
 320                                         /* function names */
 321                                         while (isspace(*s))
 322                                                 s++;
 323                                         singlefunctions(line +2, s);
 324                                         break;
 325                                 default:
 326                                         defaultline(line);
 327                         }
 328                 }
 329                 else {
 330                         defaultline(line);
 331                 }
 332         }
 333         fflush(stdout);
 334 }
 335
 336
 337 int main(int argc, char **argv)
 338 {
 339         FILE * infile;
 340         if (argc != 3) {
 341                 usage();
 342                 exit(1);
 343         }
 344         /* Open file, exit on error */
 345         infile = fopen(argv[2], "r");
 346         if (infile == NULL) {
 347                 fprintf(stderr, "docproc: ");
 348                 perror(argv[2]);
 349                 exit(2);
 350         }
 351
 352         if (strcmp("doc", argv[1]) == 0)
 353         {
 354                 /* Need to do this in two passes.
 355                  * First pass is used to collect all symbols exported
 356                  * in the various files.
 357                  * Second pass generate the documentation.
 358                  * This is required because function are declared
 359                  * and exported in different files :-((
 360                  */
 361                 /* Collect symbols */
 362                 defaultline       = noaction;
 363                 internalfunctions = find_export_symbols;
 364                 externalfunctions = find_export_symbols;
 365                 symbolsonly       = find_export_symbols;
 366                 singlefunctions   = noaction2;
 367                 parse_file(infile);
 368
 369                 /* Rewind to start from beginning of file again */
 370                 fseek(infile, 0, SEEK_SET);
 371                 defaultline       = printline;
 372                 internalfunctions = intfunc;
 373                 externalfunctions = extfunc;
 374                 symbolsonly       = printline;
 375                 singlefunctions   = singfunc;
 376
 377                 parse_file(infile);
 378         }
 379         else if (strcmp("depend", argv[1]) == 0)
 380         {
 381                 /* Create first part of dependency chain
 382                  * file.tmpl */
 383                 printf("%s\t", argv[2]);
 384                 defaultline       = noaction;
 385                 internalfunctions = adddep;
 386                 externalfunctions = adddep;
 387                 symbolsonly       = adddep;
 388                 singlefunctions   = adddep2;
 389                 parse_file(infile);
 390                 printf("\n");
 391         }
 392         else
 393         {
 394                 fprintf(stderr, "Unknown option: %s\n", argv[1]);
 395                 exit(1);
 396         }
 397         fclose(infile);
 398         fflush(stdout);
 399         return exitstatus;
 400 }