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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 is scanned for
* any symbols that are exported via these macros:
* EXPORT_SYMBOL(), EXPORT_SYMBOL_GPL(), &
* EXPORT_SYMBOL_GPL_FUTURE()
* 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"
char *srctree;
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");
fprintf(stderr, "Environment variable SRCTREE: absolute path to kernel source tree.\n");
}
/*
* Execute kernel-doc with parameters given 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, 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 in filename that are exported with EXPORT_SYMBOL &
* EXPORT_SYMBOL_GPL (& EXPORT_SYMBOL_GPL_FUTURE implicitly).
* 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, 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);
exit(1);
}
while (fgets(line, MAXLINESZ, fp)) {
char *p;
char *e;
if (((p = strstr(line, "EXPORT_SYMBOL_GPL")) != NULL) ||
((p = strstr(line, "EXPORT_SYMBOL")) != NULL)) {
/* Skip EXPORT_SYMBOL{_GPL} */
while (isalnum(*p) || *p == '_')
p++;
/* Remove parentheses & additional whitespace */
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 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 specific 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 preceded 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;
srctree = getenv("SRCTREE");
if (!srctree)
srctree = getcwd(NULL, 0);
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;
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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