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- /*
- * docproc is a simple preprocessor for the template files
- * used as placeholders for the kernel internal documentation.
- * docproc is used for documentation-frontend and
- * dependency-generator.
- * The two usages have in common that they require
- * some knowledge of the .tmpl syntax, therefore they
- * are kept together.
- *
- * documentation-frontend
- * Scans the template file and call kernel-doc for
- * all occurrences of ![EIF]file
- * Beforehand each referenced file are scanned for
- * any exported sympols "EXPORT_SYMBOL()" statements.
- * This is used to create proper -function and
- * -nofunction arguments in calls to kernel-doc.
- * Usage: docproc doc file.tmpl
- *
- * dependency-generator:
- * Scans the template file and list all files
- * referenced in a format recognized by make.
- * Usage: docproc depend file.tmpl
- * Writes dependency information to stdout
- * in the following format:
- * file.tmpl src.c src2.c
- * The filenames are obtained from the following constructs:
- * !Efilename
- * !Ifilename
- * !Dfilename
- * !Ffilename
- *
- */
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <ctype.h>
- #include <unistd.h>
- #include <limits.h>
- #include <sys/types.h>
- #include <sys/wait.h>
- /* exitstatus is used to keep track of any failing calls to kernel-doc,
- * but execution continues. */
- int exitstatus = 0;
- typedef void DFL(char *);
- DFL *defaultline;
- typedef void FILEONLY(char * file);
- FILEONLY *internalfunctions;
- FILEONLY *externalfunctions;
- FILEONLY *symbolsonly;
- typedef void FILELINE(char * file, char * line);
- FILELINE * singlefunctions;
- FILELINE * entity_system;
- #define MAXLINESZ 2048
- #define MAXFILES 250
- #define KERNELDOCPATH "scripts/"
- #define KERNELDOC "kernel-doc"
- #define DOCBOOK "-docbook"
- #define FUNCTION "-function"
- #define NOFUNCTION "-nofunction"
- void usage (void)
- {
- fprintf(stderr, "Usage: docproc {doc|depend} file\n");
- fprintf(stderr, "Input is read from file.tmpl. Output is sent to stdout\n");
- fprintf(stderr, "doc: frontend when generating kernel documentation\n");
- fprintf(stderr, "depend: generate list of files referenced within file\n");
- }
- /*
- * Execute kernel-doc with parameters givin in svec
- */
- void exec_kernel_doc(char **svec)
- {
- pid_t pid;
- int ret;
- char real_filename[PATH_MAX + 1];
- /* Make sure output generated so far are flushed */
- fflush(stdout);
- switch(pid=fork()) {
- case -1:
- perror("fork");
- exit(1);
- case 0:
- memset(real_filename, 0, sizeof(real_filename));
- strncat(real_filename, getenv("SRCTREE"), PATH_MAX);
- strncat(real_filename, KERNELDOCPATH KERNELDOC,
- PATH_MAX - strlen(real_filename));
- execvp(real_filename, svec);
- fprintf(stderr, "exec ");
- perror(real_filename);
- exit(1);
- default:
- waitpid(pid, &ret ,0);
- }
- if (WIFEXITED(ret))
- exitstatus |= WEXITSTATUS(ret);
- else
- exitstatus = 0xff;
- }
- /* Types used to create list of all exported symbols in a number of files */
- struct symbols
- {
- char *name;
- };
- struct symfile
- {
- char *filename;
- struct symbols *symbollist;
- int symbolcnt;
- };
- struct symfile symfilelist[MAXFILES];
- int symfilecnt = 0;
- void add_new_symbol(struct symfile *sym, char * symname)
- {
- sym->symbollist =
- realloc(sym->symbollist, (sym->symbolcnt + 1) * sizeof(char *));
- sym->symbollist[sym->symbolcnt++].name = strdup(symname);
- }
- /* Add a filename to the list */
- struct symfile * add_new_file(char * filename)
- {
- symfilelist[symfilecnt++].filename = strdup(filename);
- return &symfilelist[symfilecnt - 1];
- }
- /* Check if file already are present in the list */
- struct symfile * filename_exist(char * filename)
- {
- int i;
- for (i=0; i < symfilecnt; i++)
- if (strcmp(symfilelist[i].filename, filename) == 0)
- return &symfilelist[i];
- return NULL;
- }
- /*
- * List all files referenced within the template file.
- * Files are separated by tabs.
- */
- void adddep(char * file) { printf("\t%s", file); }
- void adddep2(char * file, char * line) { line = line; adddep(file); }
- void noaction(char * line) { line = line; }
- void noaction2(char * file, char * line) { file = file; line = line; }
- /* Echo the line without further action */
- void printline(char * line) { printf("%s", line); }
- /*
- * Find all symbols exported with EXPORT_SYMBOL and EXPORT_SYMBOL_GPL
- * in filename.
- * All symbols located are stored in symfilelist.
- */
- void find_export_symbols(char * filename)
- {
- FILE * fp;
- struct symfile *sym;
- char line[MAXLINESZ];
- if (filename_exist(filename) == NULL) {
- char real_filename[PATH_MAX + 1];
- memset(real_filename, 0, sizeof(real_filename));
- strncat(real_filename, getenv("SRCTREE"), PATH_MAX);
- strncat(real_filename, filename,
- PATH_MAX - strlen(real_filename));
- sym = add_new_file(filename);
- fp = fopen(real_filename, "r");
- if (fp == NULL)
- {
- fprintf(stderr, "docproc: ");
- perror(real_filename);
- }
- while(fgets(line, MAXLINESZ, fp)) {
- char *p;
- char *e;
- if (((p = strstr(line, "EXPORT_SYMBOL_GPL")) != 0) ||
- ((p = strstr(line, "EXPORT_SYMBOL")) != 0)) {
- /* Skip EXPORT_SYMBOL{_GPL} */
- while (isalnum(*p) || *p == '_')
- p++;
- /* Remove paranteses and additional ws */
- while (isspace(*p))
- p++;
- if (*p != '(')
- continue; /* Syntax error? */
- else
- p++;
- while (isspace(*p))
- p++;
- e = p;
- while (isalnum(*e) || *e == '_')
- e++;
- *e = '\0';
- add_new_symbol(sym, p);
- }
- }
- fclose(fp);
- }
- }
- /*
- * Document all external or internal functions in a file.
- * Call kernel-doc with following parameters:
- * kernel-doc -docbook -nofunction function_name1 filename
- * function names are obtained from all the the src files
- * by find_export_symbols.
- * intfunc uses -nofunction
- * extfunc uses -function
- */
- void docfunctions(char * filename, char * type)
- {
- int i,j;
- int symcnt = 0;
- int idx = 0;
- char **vec;
- for (i=0; i <= symfilecnt; i++)
- symcnt += symfilelist[i].symbolcnt;
- vec = malloc((2 + 2 * symcnt + 2) * sizeof(char*));
- if (vec == NULL) {
- perror("docproc: ");
- exit(1);
- }
- vec[idx++] = KERNELDOC;
- vec[idx++] = DOCBOOK;
- for (i=0; i < symfilecnt; i++) {
- struct symfile * sym = &symfilelist[i];
- for (j=0; j < sym->symbolcnt; j++) {
- vec[idx++] = type;
- vec[idx++] = sym->symbollist[j].name;
- }
- }
- vec[idx++] = filename;
- vec[idx] = NULL;
- printf("<!-- %s -->\n", filename);
- exec_kernel_doc(vec);
- fflush(stdout);
- free(vec);
- }
- void intfunc(char * filename) { docfunctions(filename, NOFUNCTION); }
- void extfunc(char * filename) { docfunctions(filename, FUNCTION); }
- /*
- * Document spåecific function(s) in a file.
- * Call kernel-doc with the following parameters:
- * kernel-doc -docbook -function function1 [-function function2]
- */
- void singfunc(char * filename, char * line)
- {
- char *vec[200]; /* Enough for specific functions */
- int i, idx = 0;
- int startofsym = 1;
- vec[idx++] = KERNELDOC;
- vec[idx++] = DOCBOOK;
- /* Split line up in individual parameters preceeded by FUNCTION */
- for (i=0; line[i]; i++) {
- if (isspace(line[i])) {
- line[i] = '\0';
- startofsym = 1;
- continue;
- }
- if (startofsym) {
- startofsym = 0;
- vec[idx++] = FUNCTION;
- vec[idx++] = &line[i];
- }
- }
- vec[idx++] = filename;
- vec[idx] = NULL;
- exec_kernel_doc(vec);
- }
- /*
- * Parse file, calling action specific functions for:
- * 1) Lines containing !E
- * 2) Lines containing !I
- * 3) Lines containing !D
- * 4) Lines containing !F
- * 5) Default lines - lines not matching the above
- */
- void parse_file(FILE *infile)
- {
- char line[MAXLINESZ];
- char * s;
- while(fgets(line, MAXLINESZ, infile)) {
- if (line[0] == '!') {
- s = line + 2;
- switch (line[1]) {
- case 'E':
- while (*s && !isspace(*s)) s++;
- *s = '\0';
- externalfunctions(line+2);
- break;
- case 'I':
- while (*s && !isspace(*s)) s++;
- *s = '\0';
- internalfunctions(line+2);
- break;
- case 'D':
- while (*s && !isspace(*s)) s++;
- *s = '\0';
- symbolsonly(line+2);
- break;
- case 'F':
- /* filename */
- while (*s && !isspace(*s)) s++;
- *s++ = '\0';
- /* function names */
- while (isspace(*s))
- s++;
- singlefunctions(line +2, s);
- break;
- default:
- defaultline(line);
- }
- }
- else {
- defaultline(line);
- }
- }
- fflush(stdout);
- }
- int main(int argc, char *argv[])
- {
- FILE * infile;
- 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 function 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;
- 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;
- parse_file(infile);
- }
- 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;
- parse_file(infile);
- printf("\n");
- }
- else
- {
- fprintf(stderr, "Unknown option: %s\n", argv[1]);
- exit(1);
- }
- fclose(infile);
- fflush(stdout);
- return exitstatus;
- }
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