581 lines
14 KiB
C
581 lines
14 KiB
C
/*
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* docproc is a simple preprocessor for the template files
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* used as placeholders for the kernel internal documentation.
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* docproc is used for documentation-frontend and
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* dependency-generator.
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* The two usages have in common that they require
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* some knowledge of the .tmpl syntax, therefore they
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* are kept together.
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*
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* documentation-frontend
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* Scans the template file and call kernel-doc for
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* all occurrences of ![EIF]file
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* Beforehand each referenced file is scanned for
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* any symbols that are exported via these macros:
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* EXPORT_SYMBOL(), EXPORT_SYMBOL_GPL(), &
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* EXPORT_SYMBOL_GPL_FUTURE()
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* This is used to create proper -function and
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* -nofunction arguments in calls to kernel-doc.
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* Usage: docproc doc file.tmpl
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*
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* dependency-generator:
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* Scans the template file and list all files
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* referenced in a format recognized by make.
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* Usage: docproc depend file.tmpl
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* Writes dependency information to stdout
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* in the following format:
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* file.tmpl src.c src2.c
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* The filenames are obtained from the following constructs:
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* !Efilename
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* !Ifilename
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* !Dfilename
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* !Ffilename
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* !Pfilename
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*
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*/
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#define _GNU_SOURCE
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include <unistd.h>
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#include <limits.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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/* exitstatus is used to keep track of any failing calls to kernel-doc,
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* but execution continues. */
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int exitstatus = 0;
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typedef void DFL(char *);
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DFL *defaultline;
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typedef void FILEONLY(char * file);
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FILEONLY *internalfunctions;
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FILEONLY *externalfunctions;
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FILEONLY *symbolsonly;
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FILEONLY *findall;
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typedef void FILELINE(char * file, char * line);
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FILELINE * singlefunctions;
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FILELINE * entity_system;
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FILELINE * docsection;
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#define MAXLINESZ 2048
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#define MAXFILES 250
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#define KERNELDOCPATH "scripts/"
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#define KERNELDOC "kernel-doc"
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#define DOCBOOK "-docbook"
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#define LIST "-list"
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#define FUNCTION "-function"
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#define NOFUNCTION "-nofunction"
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#define NODOCSECTIONS "-no-doc-sections"
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#define SHOWNOTFOUND "-show-not-found"
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static char *srctree, *kernsrctree;
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static char **all_list = NULL;
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static int all_list_len = 0;
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static void consume_symbol(const char *sym)
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{
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int i;
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for (i = 0; i < all_list_len; i++) {
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if (!all_list[i])
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continue;
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if (strcmp(sym, all_list[i]))
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continue;
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all_list[i] = NULL;
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break;
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}
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}
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static void usage (void)
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{
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fprintf(stderr, "Usage: docproc {doc|depend} file\n");
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fprintf(stderr, "Input is read from file.tmpl. Output is sent to stdout\n");
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fprintf(stderr, "doc: frontend when generating kernel documentation\n");
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fprintf(stderr, "depend: generate list of files referenced within file\n");
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fprintf(stderr, "Environment variable SRCTREE: absolute path to sources.\n");
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fprintf(stderr, " KBUILD_SRC: absolute path to kernel source tree.\n");
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}
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/*
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* Execute kernel-doc with parameters given in svec
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*/
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static void exec_kernel_doc(char **svec)
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{
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pid_t pid;
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int ret;
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char real_filename[PATH_MAX + 1];
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/* Make sure output generated so far are flushed */
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fflush(stdout);
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switch (pid=fork()) {
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case -1:
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perror("fork");
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exit(1);
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case 0:
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memset(real_filename, 0, sizeof(real_filename));
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strncat(real_filename, kernsrctree, PATH_MAX);
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strncat(real_filename, "/" KERNELDOCPATH KERNELDOC,
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PATH_MAX - strlen(real_filename));
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execvp(real_filename, svec);
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fprintf(stderr, "exec ");
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perror(real_filename);
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exit(1);
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default:
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waitpid(pid, &ret ,0);
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}
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if (WIFEXITED(ret))
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exitstatus |= WEXITSTATUS(ret);
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else
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exitstatus = 0xff;
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}
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/* Types used to create list of all exported symbols in a number of files */
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struct symbols
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{
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char *name;
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};
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struct symfile
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{
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char *filename;
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struct symbols *symbollist;
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int symbolcnt;
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};
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struct symfile symfilelist[MAXFILES];
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int symfilecnt = 0;
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static void add_new_symbol(struct symfile *sym, char * symname)
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{
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sym->symbollist =
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realloc(sym->symbollist, (sym->symbolcnt + 1) * sizeof(char *));
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sym->symbollist[sym->symbolcnt++].name = strdup(symname);
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}
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/* Add a filename to the list */
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static struct symfile * add_new_file(char * filename)
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{
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symfilelist[symfilecnt++].filename = strdup(filename);
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return &symfilelist[symfilecnt - 1];
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}
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/* Check if file already are present in the list */
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static struct symfile * filename_exist(char * filename)
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{
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int i;
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for (i=0; i < symfilecnt; i++)
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if (strcmp(symfilelist[i].filename, filename) == 0)
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return &symfilelist[i];
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return NULL;
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}
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/*
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* List all files referenced within the template file.
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* Files are separated by tabs.
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*/
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static void adddep(char * file) { printf("\t%s", file); }
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static void adddep2(char * file, char * line) { line = line; adddep(file); }
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static void noaction(char * line) { line = line; }
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static void noaction2(char * file, char * line) { file = file; line = line; }
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/* Echo the line without further action */
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static void printline(char * line) { printf("%s", line); }
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/*
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* Find all symbols in filename that are exported with EXPORT_SYMBOL &
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* EXPORT_SYMBOL_GPL (& EXPORT_SYMBOL_GPL_FUTURE implicitly).
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* All symbols located are stored in symfilelist.
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*/
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static void find_export_symbols(char * filename)
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{
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FILE * fp;
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struct symfile *sym;
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char line[MAXLINESZ];
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if (filename_exist(filename) == NULL) {
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char real_filename[PATH_MAX + 1];
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memset(real_filename, 0, sizeof(real_filename));
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strncat(real_filename, srctree, PATH_MAX);
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strncat(real_filename, "/", PATH_MAX - strlen(real_filename));
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strncat(real_filename, filename,
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PATH_MAX - strlen(real_filename));
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sym = add_new_file(filename);
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fp = fopen(real_filename, "r");
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if (fp == NULL) {
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fprintf(stderr, "docproc: ");
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perror(real_filename);
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exit(1);
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}
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while (fgets(line, MAXLINESZ, fp)) {
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char *p;
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char *e;
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if (((p = strstr(line, "EXPORT_SYMBOL_GPL")) != NULL) ||
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((p = strstr(line, "EXPORT_SYMBOL")) != NULL)) {
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/* Skip EXPORT_SYMBOL{_GPL} */
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while (isalnum(*p) || *p == '_')
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p++;
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/* Remove parentheses & additional whitespace */
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while (isspace(*p))
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p++;
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if (*p != '(')
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continue; /* Syntax error? */
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else
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p++;
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while (isspace(*p))
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p++;
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e = p;
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while (isalnum(*e) || *e == '_')
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e++;
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*e = '\0';
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add_new_symbol(sym, p);
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}
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}
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fclose(fp);
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}
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}
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/*
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* Document all external or internal functions in a file.
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* Call kernel-doc with following parameters:
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* kernel-doc -docbook -nofunction function_name1 filename
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* Function names are obtained from all the src files
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* by find_export_symbols.
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* intfunc uses -nofunction
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* extfunc uses -function
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*/
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static void docfunctions(char * filename, char * type)
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{
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int i,j;
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int symcnt = 0;
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int idx = 0;
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char **vec;
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for (i=0; i <= symfilecnt; i++)
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symcnt += symfilelist[i].symbolcnt;
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vec = malloc((2 + 2 * symcnt + 3) * sizeof(char *));
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if (vec == NULL) {
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perror("docproc: ");
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exit(1);
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}
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vec[idx++] = KERNELDOC;
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vec[idx++] = DOCBOOK;
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vec[idx++] = NODOCSECTIONS;
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for (i=0; i < symfilecnt; i++) {
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struct symfile * sym = &symfilelist[i];
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for (j=0; j < sym->symbolcnt; j++) {
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vec[idx++] = type;
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consume_symbol(sym->symbollist[j].name);
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vec[idx++] = sym->symbollist[j].name;
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}
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}
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vec[idx++] = filename;
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vec[idx] = NULL;
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printf("<!-- %s -->\n", filename);
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exec_kernel_doc(vec);
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fflush(stdout);
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free(vec);
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}
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static void intfunc(char * filename) { docfunctions(filename, NOFUNCTION); }
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static void extfunc(char * filename) { docfunctions(filename, FUNCTION); }
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/*
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* Document specific function(s) in a file.
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* Call kernel-doc with the following parameters:
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* kernel-doc -docbook -function function1 [-function function2]
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*/
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static void singfunc(char * filename, char * line)
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{
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char *vec[200]; /* Enough for specific functions */
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int i, idx = 0;
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int startofsym = 1;
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vec[idx++] = KERNELDOC;
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vec[idx++] = DOCBOOK;
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vec[idx++] = SHOWNOTFOUND;
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/* Split line up in individual parameters preceded by FUNCTION */
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for (i=0; line[i]; i++) {
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if (isspace(line[i])) {
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line[i] = '\0';
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startofsym = 1;
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continue;
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}
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if (startofsym) {
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startofsym = 0;
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vec[idx++] = FUNCTION;
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vec[idx++] = &line[i];
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}
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}
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for (i = 0; i < idx; i++) {
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if (strcmp(vec[i], FUNCTION))
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continue;
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consume_symbol(vec[i + 1]);
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}
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vec[idx++] = filename;
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vec[idx] = NULL;
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exec_kernel_doc(vec);
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}
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/*
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* Insert specific documentation section from a file.
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* Call kernel-doc with the following parameters:
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* kernel-doc -docbook -function "doc section" filename
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*/
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static void docsect(char *filename, char *line)
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{
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/* kerneldoc -docbook -show-not-found -function "section" file NULL */
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char *vec[7];
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char *s;
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for (s = line; *s; s++)
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if (*s == '\n')
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*s = '\0';
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if (asprintf(&s, "DOC: %s", line) < 0) {
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perror("asprintf");
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exit(1);
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}
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consume_symbol(s);
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free(s);
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vec[0] = KERNELDOC;
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vec[1] = DOCBOOK;
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vec[2] = SHOWNOTFOUND;
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vec[3] = FUNCTION;
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vec[4] = line;
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vec[5] = filename;
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vec[6] = NULL;
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exec_kernel_doc(vec);
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}
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static void find_all_symbols(char *filename)
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{
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char *vec[4]; /* kerneldoc -list file NULL */
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pid_t pid;
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int ret, i, count, start;
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char real_filename[PATH_MAX + 1];
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int pipefd[2];
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char *data, *str;
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size_t data_len = 0;
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vec[0] = KERNELDOC;
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vec[1] = LIST;
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vec[2] = filename;
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vec[3] = NULL;
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if (pipe(pipefd)) {
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perror("pipe");
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exit(1);
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}
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switch (pid=fork()) {
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case -1:
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perror("fork");
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exit(1);
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case 0:
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close(pipefd[0]);
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dup2(pipefd[1], 1);
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memset(real_filename, 0, sizeof(real_filename));
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strncat(real_filename, kernsrctree, PATH_MAX);
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strncat(real_filename, "/" KERNELDOCPATH KERNELDOC,
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PATH_MAX - strlen(real_filename));
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execvp(real_filename, vec);
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fprintf(stderr, "exec ");
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perror(real_filename);
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exit(1);
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default:
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close(pipefd[1]);
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data = malloc(4096);
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do {
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while ((ret = read(pipefd[0],
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data + data_len,
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4096)) > 0) {
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data_len += ret;
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data = realloc(data, data_len + 4096);
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}
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} while (ret == -EAGAIN);
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if (ret != 0) {
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perror("read");
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exit(1);
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}
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waitpid(pid, &ret ,0);
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}
|
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if (WIFEXITED(ret))
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exitstatus |= WEXITSTATUS(ret);
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else
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exitstatus = 0xff;
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count = 0;
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/* poor man's strtok, but with counting */
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for (i = 0; i < data_len; i++) {
|
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if (data[i] == '\n') {
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count++;
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data[i] = '\0';
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}
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}
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start = all_list_len;
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all_list_len += count;
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all_list = realloc(all_list, sizeof(char *) * all_list_len);
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str = data;
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for (i = 0; i < data_len && start != all_list_len; i++) {
|
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if (data[i] == '\0') {
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all_list[start] = str;
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str = data + i + 1;
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start++;
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}
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}
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}
|
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|
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/*
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* Parse file, calling action specific functions for:
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* 1) Lines containing !E
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* 2) Lines containing !I
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* 3) Lines containing !D
|
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* 4) Lines containing !F
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* 5) Lines containing !P
|
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* 6) Lines containing !C
|
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* 7) Default lines - lines not matching the above
|
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*/
|
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static void parse_file(FILE *infile)
|
|
{
|
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char line[MAXLINESZ];
|
|
char * s;
|
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while (fgets(line, MAXLINESZ, infile)) {
|
|
if (line[0] == '!') {
|
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s = line + 2;
|
|
switch (line[1]) {
|
|
case 'E':
|
|
while (*s && !isspace(*s)) s++;
|
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*s = '\0';
|
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externalfunctions(line+2);
|
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break;
|
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case 'I':
|
|
while (*s && !isspace(*s)) s++;
|
|
*s = '\0';
|
|
internalfunctions(line+2);
|
|
break;
|
|
case 'D':
|
|
while (*s && !isspace(*s)) s++;
|
|
*s = '\0';
|
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symbolsonly(line+2);
|
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break;
|
|
case 'F':
|
|
/* filename */
|
|
while (*s && !isspace(*s)) s++;
|
|
*s++ = '\0';
|
|
/* function names */
|
|
while (isspace(*s))
|
|
s++;
|
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singlefunctions(line +2, s);
|
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break;
|
|
case 'P':
|
|
/* filename */
|
|
while (*s && !isspace(*s)) s++;
|
|
*s++ = '\0';
|
|
/* DOC: section name */
|
|
while (isspace(*s))
|
|
s++;
|
|
docsection(line + 2, s);
|
|
break;
|
|
case 'C':
|
|
while (*s && !isspace(*s)) s++;
|
|
*s = '\0';
|
|
if (findall)
|
|
findall(line+2);
|
|
break;
|
|
default:
|
|
defaultline(line);
|
|
}
|
|
} else {
|
|
defaultline(line);
|
|
}
|
|
}
|
|
fflush(stdout);
|
|
}
|
|
|
|
|
|
int main(int argc, char *argv[])
|
|
{
|
|
FILE * infile;
|
|
int i;
|
|
|
|
srctree = getenv("SRCTREE");
|
|
if (!srctree)
|
|
srctree = getcwd(NULL, 0);
|
|
kernsrctree = getenv("KBUILD_SRC");
|
|
if (!kernsrctree || !*kernsrctree)
|
|
kernsrctree = srctree;
|
|
if (argc != 3) {
|
|
usage();
|
|
exit(1);
|
|
}
|
|
/* Open file, exit on error */
|
|
infile = fopen(argv[2], "r");
|
|
if (infile == NULL) {
|
|
fprintf(stderr, "docproc: ");
|
|
perror(argv[2]);
|
|
exit(2);
|
|
}
|
|
|
|
if (strcmp("doc", argv[1]) == 0) {
|
|
/* Need to do this in two passes.
|
|
* First pass is used to collect all symbols exported
|
|
* in the various files;
|
|
* Second pass generate the documentation.
|
|
* This is required because some functions are declared
|
|
* and exported in different files :-((
|
|
*/
|
|
/* Collect symbols */
|
|
defaultline = noaction;
|
|
internalfunctions = find_export_symbols;
|
|
externalfunctions = find_export_symbols;
|
|
symbolsonly = find_export_symbols;
|
|
singlefunctions = noaction2;
|
|
docsection = noaction2;
|
|
findall = find_all_symbols;
|
|
parse_file(infile);
|
|
|
|
/* Rewind to start from beginning of file again */
|
|
fseek(infile, 0, SEEK_SET);
|
|
defaultline = printline;
|
|
internalfunctions = intfunc;
|
|
externalfunctions = extfunc;
|
|
symbolsonly = printline;
|
|
singlefunctions = singfunc;
|
|
docsection = docsect;
|
|
findall = NULL;
|
|
|
|
parse_file(infile);
|
|
|
|
for (i = 0; i < all_list_len; i++) {
|
|
if (!all_list[i])
|
|
continue;
|
|
fprintf(stderr, "Warning: didn't use docs for %s\n",
|
|
all_list[i]);
|
|
}
|
|
} else if (strcmp("depend", argv[1]) == 0) {
|
|
/* Create first part of dependency chain
|
|
* file.tmpl */
|
|
printf("%s\t", argv[2]);
|
|
defaultline = noaction;
|
|
internalfunctions = adddep;
|
|
externalfunctions = adddep;
|
|
symbolsonly = adddep;
|
|
singlefunctions = adddep2;
|
|
docsection = adddep2;
|
|
findall = adddep;
|
|
parse_file(infile);
|
|
printf("\n");
|
|
} else {
|
|
fprintf(stderr, "Unknown option: %s\n", argv[1]);
|
|
exit(1);
|
|
}
|
|
fclose(infile);
|
|
fflush(stdout);
|
|
return exitstatus;
|
|
}
|