[GitHub/mt8127/android_kernel_alcatel_ttab.git] / scripts / basic / docproc.c

/*
 *	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
 *		!Pfilename
 *
 */

#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <unistd.h>
#include <limits.h>
#include <errno.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;
FILEONLY *findall;

typedef void FILELINE(char * file, char * line);
FILELINE * singlefunctions;
FILELINE * entity_system;
FILELINE * docsection;

#define MAXLINESZ     2048
#define MAXFILES      250
#define KERNELDOCPATH "scripts/"
#define KERNELDOC     "kernel-doc"
#define DOCBOOK       "-docbook"
#define LIST          "-list"
#define FUNCTION      "-function"
#define NOFUNCTION    "-nofunction"
#define NODOCSECTIONS "-no-doc-sections"

static char *srctree, *kernsrctree;

static char **all_list = NULL;
static int all_list_len = 0;

static void consume_symbol(const char *sym)
{
	int i;

	for (i = 0; i < all_list_len; i++) {
		if (!all_list[i])
			continue;
		if (strcmp(sym, all_list[i]))
			continue;
		all_list[i] = NULL;
		break;
	}
}

static 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 sources.\n");
	fprintf(stderr, "                     KBUILD_SRC: absolute path to kernel source tree.\n");
}

/*
 * Execute kernel-doc with parameters given in svec
 */
static 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, kernsrctree, 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;

static 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 */
static 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 */
static 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.
 */
static void adddep(char * file)		   { printf("\t%s", file); }
static void adddep2(char * file, char * line)     { line = line; adddep(file); }
static void noaction(char * line)		   { line = line; }
static void noaction2(char * file, char * line)   { file = file; line = line; }

/* Echo the line without further action */
static 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.
 */
static 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, "/", PATH_MAX - strlen(real_filename));
		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
 */
static 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 + 3) * sizeof(char *));
	if (vec == NULL) {
		perror("docproc: ");
		exit(1);
	}
	vec[idx++] = KERNELDOC;
	vec[idx++] = DOCBOOK;
	vec[idx++] = NODOCSECTIONS;
	for (i=0; i < symfilecnt; i++) {
		struct symfile * sym = &symfilelist[i];
		for (j=0; j < sym->symbolcnt; j++) {
			vec[idx++]     = type;
			consume_symbol(sym->symbollist[j].name);
			vec[idx++] = sym->symbollist[j].name;
		}
	}
	vec[idx++]     = filename;
	vec[idx] = NULL;
	printf("<!-- %s -->\n", filename);
	exec_kernel_doc(vec);
	fflush(stdout);
	free(vec);
}
static void intfunc(char * filename) {	docfunctions(filename, NOFUNCTION); }
static 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]
 */
static 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];
                }
        }
	for (i = 0; i < idx; i++) {
        	if (strcmp(vec[i], FUNCTION))
        		continue;
		consume_symbol(vec[i + 1]);
	}
	vec[idx++] = filename;
	vec[idx] = NULL;
	exec_kernel_doc(vec);
}

/*
 * Insert specific documentation section from a file.
 * Call kernel-doc with the following parameters:
 * kernel-doc -docbook -function "doc section" filename
 */
static void docsect(char *filename, char *line)
{
	char *vec[6]; /* kerneldoc -docbook -function "section" file NULL */
	char *s;

	for (s = line; *s; s++)
		if (*s == '\n')
			*s = '\0';

	if (asprintf(&s, "DOC: %s", line) < 0) {
		perror("asprintf");
		exit(1);
	}
	consume_symbol(s);
	free(s);

	vec[0] = KERNELDOC;
	vec[1] = DOCBOOK;
	vec[2] = FUNCTION;
	vec[3] = line;
	vec[4] = filename;
	vec[5] = NULL;
	exec_kernel_doc(vec);
}

static void find_all_symbols(char *filename)
{
	char *vec[4]; /* kerneldoc -list file NULL */
	pid_t pid;
	int ret, i, count, start;
	char real_filename[PATH_MAX + 1];
	int pipefd[2];
	char *data, *str;
	size_t data_len = 0;

	vec[0] = KERNELDOC;
	vec[1] = LIST;
	vec[2] = filename;
	vec[3] = NULL;

	if (pipe(pipefd)) {
		perror("pipe");
		exit(1);
	}

	switch (pid=fork()) {
		case -1:
			perror("fork");
			exit(1);
		case  0:
			close(pipefd[0]);
			dup2(pipefd[1], 1);
			memset(real_filename, 0, sizeof(real_filename));
			strncat(real_filename, kernsrctree, PATH_MAX);
			strncat(real_filename, "/" KERNELDOCPATH KERNELDOC,
					PATH_MAX - strlen(real_filename));
			execvp(real_filename, vec);
			fprintf(stderr, "exec ");
			perror(real_filename);
			exit(1);
		default:
			close(pipefd[1]);
			data = malloc(4096);
			do {
				while ((ret = read(pipefd[0],
						   data + data_len,
						   4096)) > 0) {
					data_len += ret;
					data = realloc(data, data_len + 4096);
				}
			} while (ret == -EAGAIN);
			if (ret != 0) {
				perror("read");
				exit(1);
			}
			waitpid(pid, &ret ,0);
	}
	if (WIFEXITED(ret))
		exitstatus |= WEXITSTATUS(ret);
	else
		exitstatus = 0xff;

	count = 0;
	/* poor man's strtok, but with counting */
	for (i = 0; i < data_len; i++) {
		if (data[i] == '\n') {
			count++;
			data[i] = '\0';
		}
	}
	start = all_list_len;
	all_list_len += count;
	all_list = realloc(all_list, sizeof(char *) * all_list_len);
	str = data;
	for (i = 0; i < data_len && start != all_list_len; i++) {
		if (data[i] == '\0') {
			all_list[start] = str;
			str = data + i + 1;
			start++;
		}
	}
}

/*
 * Parse file, calling action specific functions for:
 * 1) Lines containing !E
 * 2) Lines containing !I
 * 3) Lines containing !D
 * 4) Lines containing !F
 * 5) Lines containing !P
 * 6) Lines containing !C
 * 7) Default lines - lines not matching the above
 */
static 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;
				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;
}
Commit	Line	Data
1da177e4 LT	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
6dd16f44 RD	13	* Beforehand each referenced file is scanned for
	14	* any symbols that are exported via these macros:
	15	* EXPORT_SYMBOL(), EXPORT_SYMBOL_GPL(), &
	16	* EXPORT_SYMBOL_GPL_FUTURE()
1da177e4 LT	17	* This is used to create proper -function and
	18	* -nofunction arguments in calls to kernel-doc.
	19	* Usage: docproc doc file.tmpl
	20	*
	21	* dependency-generator:
	22	* Scans the template file and list all files
	23	* referenced in a format recognized by make.
	24	* Usage: docproc depend file.tmpl
	25	* Writes dependency information to stdout
	26	* in the following format:
	27	* file.tmpl src.c src2.c
	28	* The filenames are obtained from the following constructs:
	29	* !Efilename
	30	* !Ifilename
	31	* !Dfilename
	32	* !Ffilename
e662af42	33	* !Pfilename
1da177e4 LT	34	*
	35	*/
	36
eda603f6	37	#define _GNU_SOURCE
1da177e4 LT	38	#include <stdio.h>
	39	#include <stdlib.h>
	40	#include <string.h>
	41	#include <ctype.h>
	42	#include <unistd.h>
	43	#include <limits.h>
eda603f6	44	#include <errno.h>
1da177e4 LT	45	#include <sys/types.h>
	46	#include <sys/wait.h>
	47
	48	/* exitstatus is used to keep track of any failing calls to kernel-doc,
	49	* but execution continues. */
	50	int exitstatus = 0;
	51
	52	typedef void DFL(char *);
	53	DFL *defaultline;
	54
	55	typedef void FILEONLY(char * file);
	56	FILEONLY *internalfunctions;
	57	FILEONLY *externalfunctions;
	58	FILEONLY *symbolsonly;
eda603f6	59	FILEONLY *findall;
1da177e4	60
48b9d03c	61	typedef void FILELINE(char * file, char * line);
1da177e4 LT	62	FILELINE * singlefunctions;
1da177e4 LT	63	FILELINE * entity_system;
e662af42	64	FILELINE * docsection;
1da177e4 LT	65
	66	#define MAXLINESZ 2048
	67	#define MAXFILES 250
	68	#define KERNELDOCPATH "scripts/"
	69	#define KERNELDOC "kernel-doc"
	70	#define DOCBOOK "-docbook"
eda603f6	71	#define LIST "-list"
1da177e4 LT	72	#define FUNCTION "-function"
1da177e4 LT	73	#define NOFUNCTION "-nofunction"
2e95972c	74	#define NODOCSECTIONS "-no-doc-sections"
1da177e4	75
2d51005c	76	static char srctree, kernsrctree;
bb13be51	77
eda603f6 JB	78	static char **all_list = NULL;
	79	static int all_list_len = 0;
	80
	81	static void consume_symbol(const char *sym)
	82	{
	83	int i;
	84
	85	for (i = 0; i < all_list_len; i++) {
	86	if (!all_list[i])
	87	continue;
	88	if (strcmp(sym, all_list[i]))
	89	continue;
	90	all_list[i] = NULL;
	91	break;
	92	}
	93	}
	94
4356f489	95	static void usage (void)
1da177e4 LT	96	{
	97	fprintf(stderr, "Usage: docproc {doc\|depend} file\n");
	98	fprintf(stderr, "Input is read from file.tmpl. Output is sent to stdout\n");
	99	fprintf(stderr, "doc: frontend when generating kernel documentation\n");
	100	fprintf(stderr, "depend: generate list of files referenced within file\n");
2d51005c JS	101	fprintf(stderr, "Environment variable SRCTREE: absolute path to sources.\n");
2d51005c JS	102	fprintf(stderr, " KBUILD_SRC: absolute path to kernel source tree.\n");
1da177e4 LT	103	}
	104
	105	/*
6dd16f44	106	* Execute kernel-doc with parameters given in svec
1da177e4	107	*/
4356f489	108	static void exec_kernel_doc(char **svec)
1da177e4 LT	109	{
	110	pid_t pid;
	111	int ret;
	112	char real_filename[PATH_MAX + 1];
	113	/* Make sure output generated so far are flushed */
	114	fflush(stdout);
6dd16f44	115	switch (pid=fork()) {
1da177e4 LT	116	case -1:
	117	perror("fork");
	118	exit(1);
	119	case 0:
	120	memset(real_filename, 0, sizeof(real_filename));
2d51005c JS	121	strncat(real_filename, kernsrctree, PATH_MAX);
2d51005c JS	122	strncat(real_filename, "/" KERNELDOCPATH KERNELDOC,
1da177e4 LT	123	PATH_MAX - strlen(real_filename));
	124	execvp(real_filename, svec);
	125	fprintf(stderr, "exec ");
	126	perror(real_filename);
	127	exit(1);
	128	default:
	129	waitpid(pid, &ret ,0);
	130	}
	131	if (WIFEXITED(ret))
	132	exitstatus \|= WEXITSTATUS(ret);
	133	else
	134	exitstatus = 0xff;
	135	}
	136
	137	/* Types used to create list of all exported symbols in a number of files */
	138	struct symbols
	139	{
	140	char *name;
	141	};
	142
	143	struct symfile
	144	{
	145	char *filename;
	146	struct symbols *symbollist;
	147	int symbolcnt;
	148	};
	149
	150	struct symfile symfilelist[MAXFILES];
	151	int symfilecnt = 0;
	152
4356f489	153	static void add_new_symbol(struct symfile sym, char symname)
1da177e4 LT	154	{
	155	sym->symbollist =
	156	realloc(sym->symbollist, (sym->symbolcnt + 1) * sizeof(char *));
	157	sym->symbollist[sym->symbolcnt++].name = strdup(symname);
	158	}
	159
	160	/* Add a filename to the list */
4356f489	161	static struct symfile * add_new_file(char * filename)
1da177e4 LT	162	{
	163	symfilelist[symfilecnt++].filename = strdup(filename);
	164	return &symfilelist[symfilecnt - 1];
	165	}
6dd16f44	166
1da177e4	167	/* Check if file already are present in the list */
4356f489	168	static struct symfile * filename_exist(char * filename)
1da177e4 LT	169	{
	170	int i;
	171	for (i=0; i < symfilecnt; i++)
	172	if (strcmp(symfilelist[i].filename, filename) == 0)
	173	return &symfilelist[i];
	174	return NULL;
	175	}
	176
	177	/*
	178	* List all files referenced within the template file.
	179	* Files are separated by tabs.
	180	*/
4356f489 TK	181	static void adddep(char * file) { printf("\t%s", file); }
	182	static void adddep2(char * file, char * line) { line = line; adddep(file); }
	183	static void noaction(char * line) { line = line; }
	184	static void noaction2(char * file, char * line) { file = file; line = line; }
1da177e4 LT	185
1da177e4 LT	186	/* Echo the line without further action */
4356f489	187	static void printline(char * line) { printf("%s", line); }
1da177e4 LT	188
1da177e4 LT	189	/*
6dd16f44 RD	190	* Find all symbols in filename that are exported with EXPORT_SYMBOL &
6dd16f44 RD	191	* EXPORT_SYMBOL_GPL (& EXPORT_SYMBOL_GPL_FUTURE implicitly).
1da177e4 LT	192	* All symbols located are stored in symfilelist.
1da177e4 LT	193	*/
4356f489	194	static void find_export_symbols(char * filename)
1da177e4 LT	195	{
	196	FILE * fp;
	197	struct symfile *sym;
	198	char line[MAXLINESZ];
	199	if (filename_exist(filename) == NULL) {
	200	char real_filename[PATH_MAX + 1];
	201	memset(real_filename, 0, sizeof(real_filename));
bb13be51	202	strncat(real_filename, srctree, PATH_MAX);
2d51005c	203	strncat(real_filename, "/", PATH_MAX - strlen(real_filename));
1da177e4 LT	204	strncat(real_filename, filename,
	205	PATH_MAX - strlen(real_filename));
	206	sym = add_new_file(filename);
	207	fp = fopen(real_filename, "r");
	208	if (fp == NULL)
	209	{
	210	fprintf(stderr, "docproc: ");
	211	perror(real_filename);
074a5dde	212	exit(1);
1da177e4	213	}
6dd16f44	214	while (fgets(line, MAXLINESZ, fp)) {
48b9d03c M	215	char *p;
48b9d03c M	216	char *e;
6dd16f44 RD	217	if (((p = strstr(line, "EXPORT_SYMBOL_GPL")) != NULL) \|\|
6dd16f44 RD	218	((p = strstr(line, "EXPORT_SYMBOL")) != NULL)) {
1da177e4 LT	219	/* Skip EXPORT_SYMBOL{_GPL} */
	220	while (isalnum(p) \|\| p == '_')
	221	p++;
6dd16f44	222	/* Remove parentheses & additional whitespace */
1da177e4 LT	223	while (isspace(*p))
	224	p++;
	225	if (*p != '(')
	226	continue; /* Syntax error? */
	227	else
	228	p++;
	229	while (isspace(*p))
	230	p++;
	231	e = p;
	232	while (isalnum(e) \|\| e == '_')
	233	e++;
	234	*e = '\0';
	235	add_new_symbol(sym, p);
	236	}
	237	}
	238	fclose(fp);
	239	}
	240	}
	241
	242	/*
	243	* Document all external or internal functions in a file.
	244	* Call kernel-doc with following parameters:
	245	* kernel-doc -docbook -nofunction function_name1 filename
6dd16f44	246	* Function names are obtained from all the src files
1da177e4 LT	247	* by find_export_symbols.
	248	* intfunc uses -nofunction
	249	* extfunc uses -function
	250	*/
4356f489	251	static void docfunctions(char * filename, char * type)
1da177e4 LT	252	{
	253	int i,j;
	254	int symcnt = 0;
	255	int idx = 0;
	256	char **vec;
	257
	258	for (i=0; i <= symfilecnt; i++)
	259	symcnt += symfilelist[i].symbolcnt;
2e95972c	260	vec = malloc((2 + 2 * symcnt + 3) * sizeof(char *));
1da177e4 LT	261	if (vec == NULL) {
	262	perror("docproc: ");
	263	exit(1);
	264	}
	265	vec[idx++] = KERNELDOC;
	266	vec[idx++] = DOCBOOK;
2e95972c	267	vec[idx++] = NODOCSECTIONS;
1da177e4 LT	268	for (i=0; i < symfilecnt; i++) {
	269	struct symfile * sym = &symfilelist[i];
	270	for (j=0; j < sym->symbolcnt; j++) {
	271	vec[idx++] = type;
eda603f6	272	consume_symbol(sym->symbollist[j].name);
1da177e4 LT	273	vec[idx++] = sym->symbollist[j].name;
	274	}
	275	}
	276	vec[idx++] = filename;
	277	vec[idx] = NULL;
	278	printf("<!-- %s -->\n", filename);
	279	exec_kernel_doc(vec);
	280	fflush(stdout);
	281	free(vec);
	282	}
4356f489 TK	283	static void intfunc(char * filename) { docfunctions(filename, NOFUNCTION); }
4356f489 TK	284	static void extfunc(char * filename) { docfunctions(filename, FUNCTION); }
1da177e4 LT	285
1da177e4 LT	286	/*
c6120938	287	* Document specific function(s) in a file.
1da177e4 LT	288	* Call kernel-doc with the following parameters:
	289	* kernel-doc -docbook -function function1 [-function function2]
	290	*/
4356f489	291	static void singfunc(char * filename, char * line)
1da177e4 LT	292	{
	293	char vec[200]; / Enough for specific functions */
	294	int i, idx = 0;
	295	int startofsym = 1;
	296	vec[idx++] = KERNELDOC;
	297	vec[idx++] = DOCBOOK;
	298
6dd16f44	299	/* Split line up in individual parameters preceded by FUNCTION */
1da177e4 LT	300	for (i=0; line[i]; i++) {
	301	if (isspace(line[i])) {
	302	line[i] = '\0';
	303	startofsym = 1;
	304	continue;
	305	}
	306	if (startofsym) {
	307	startofsym = 0;
	308	vec[idx++] = FUNCTION;
	309	vec[idx++] = &line[i];
	310	}
	311	}
eda603f6 JB	312	for (i = 0; i < idx; i++) {
	313	if (strcmp(vec[i], FUNCTION))
	314	continue;
	315	consume_symbol(vec[i + 1]);
	316	}
1da177e4 LT	317	vec[idx++] = filename;
	318	vec[idx] = NULL;
	319	exec_kernel_doc(vec);
	320	}
	321
e662af42 JB	322	/*
	323	* Insert specific documentation section from a file.
	324	* Call kernel-doc with the following parameters:
	325	* kernel-doc -docbook -function "doc section" filename
	326	*/
4356f489	327	static void docsect(char filename, char line)
e662af42 JB	328	{
	329	char vec[6]; / kerneldoc -docbook -function "section" file NULL */
	330	char *s;
	331
	332	for (s = line; *s; s++)
	333	if (*s == '\n')
	334	*s = '\0';
	335
d0f95c78 NK	336	if (asprintf(&s, "DOC: %s", line) < 0) {
	337	perror("asprintf");
	338	exit(1);
	339	}
eda603f6 JB	340	consume_symbol(s);
	341	free(s);
	342
e662af42 JB	343	vec[0] = KERNELDOC;
	344	vec[1] = DOCBOOK;
	345	vec[2] = FUNCTION;
	346	vec[3] = line;
	347	vec[4] = filename;
	348	vec[5] = NULL;
	349	exec_kernel_doc(vec);
	350	}
	351
eda603f6 JB	352	static void find_all_symbols(char *filename)
	353	{
	354	char vec[4]; / kerneldoc -list file NULL */
	355	pid_t pid;
	356	int ret, i, count, start;
	357	char real_filename[PATH_MAX + 1];
	358	int pipefd[2];
	359	char data, str;
	360	size_t data_len = 0;
	361
	362	vec[0] = KERNELDOC;
	363	vec[1] = LIST;
	364	vec[2] = filename;
	365	vec[3] = NULL;
	366
	367	if (pipe(pipefd)) {
	368	perror("pipe");
	369	exit(1);
	370	}
	371
	372	switch (pid=fork()) {
	373	case -1:
	374	perror("fork");
	375	exit(1);
	376	case 0:
	377	close(pipefd[0]);
	378	dup2(pipefd[1], 1);
	379	memset(real_filename, 0, sizeof(real_filename));
	380	strncat(real_filename, kernsrctree, PATH_MAX);
	381	strncat(real_filename, "/" KERNELDOCPATH KERNELDOC,
	382	PATH_MAX - strlen(real_filename));
	383	execvp(real_filename, vec);
	384	fprintf(stderr, "exec ");
	385	perror(real_filename);
	386	exit(1);
	387	default:
	388	close(pipefd[1]);
	389	data = malloc(4096);
	390	do {
	391	while ((ret = read(pipefd[0],
	392	data + data_len,
	393	4096)) > 0) {
	394	data_len += ret;
	395	data = realloc(data, data_len + 4096);
	396	}
	397	} while (ret == -EAGAIN);
	398	if (ret != 0) {
	399	perror("read");
	400	exit(1);
	401	}
	402	waitpid(pid, &ret ,0);
	403	}
	404	if (WIFEXITED(ret))
	405	exitstatus \|= WEXITSTATUS(ret);
	406	else
	407	exitstatus = 0xff;
	408
	409	count = 0;
	410	/* poor man's strtok, but with counting */
	411	for (i = 0; i < data_len; i++) {
	412	if (data[i] == '\n') {
	413	count++;
	414	data[i] = '\0';
	415	}
416	}
417	start = all_list_len;
418	all_list_len += count;
419	all_list = realloc(all_list, sizeof(char ) all_list_len);
420	str = data;
421	for (i = 0; i < data_len && start != all_list_len; i++) {
422	if (data[i] == '\0') {
423	all_list[start] = str;
424	str = data + i + 1;
425	start++;
426	}
427	}
428	}
429
1da177e4 LT	430	/*
	431	* Parse file, calling action specific functions for:
	432	* 1) Lines containing !E
	433	* 2) Lines containing !I
	434	* 3) Lines containing !D
	435	* 4) Lines containing !F
e662af42	436	* 5) Lines containing !P
eda603f6 JB	437	* 6) Lines containing !C
eda603f6 JB	438	* 7) Default lines - lines not matching the above
1da177e4	439	*/
4356f489	440	static void parse_file(FILE *infile)
1da177e4 LT	441	{
1da177e4 LT	442	char line[MAXLINESZ];
48b9d03c	443	char * s;
6dd16f44	444	while (fgets(line, MAXLINESZ, infile)) {
1da177e4 LT	445	if (line[0] == '!') {
	446	s = line + 2;
	447	switch (line[1]) {
	448	case 'E':
	449	while (s && !isspace(s)) s++;
	450	*s = '\0';
	451	externalfunctions(line+2);
	452	break;
	453	case 'I':
	454	while (s && !isspace(s)) s++;
	455	*s = '\0';
	456	internalfunctions(line+2);
	457	break;
	458	case 'D':
	459	while (s && !isspace(s)) s++;
	460	*s = '\0';
	461	symbolsonly(line+2);
	462	break;
	463	case 'F':
	464	/* filename */
	465	while (s && !isspace(s)) s++;
	466	*s++ = '\0';
	467	/* function names */
	468	while (isspace(*s))
	469	s++;
	470	singlefunctions(line +2, s);
	471	break;
e662af42 JB	472	case 'P':
	473	/* filename */
	474	while (s && !isspace(s)) s++;
	475	*s++ = '\0';
	476	/* DOC: section name */
	477	while (isspace(*s))
	478	s++;
	479	docsection(line + 2, s);
	480	break;
eda603f6 JB	481	case 'C':
	482	while (s && !isspace(s)) s++;
	483	*s = '\0';
	484	if (findall)
	485	findall(line+2);
	486	break;
1da177e4 LT	487	default:
	488	defaultline(line);
	489	}
	490	}
	491	else {
	492	defaultline(line);
	493	}
	494	}
	495	fflush(stdout);
	496	}
	497
	498
	499	int main(int argc, char *argv[])
	500	{
	501	FILE * infile;
eda603f6	502	int i;
bb13be51 RL	503
	504	srctree = getenv("SRCTREE");
	505	if (!srctree)
	506	srctree = getcwd(NULL, 0);
2d51005c	507	kernsrctree = getenv("KBUILD_SRC");
b767b905	508	if (!kernsrctree \|\| !*kernsrctree)
2d51005c	509	kernsrctree = srctree;
1da177e4 LT	510	if (argc != 3) {
	511	usage();
	512	exit(1);
	513	}
	514	/* Open file, exit on error */
	515	infile = fopen(argv[2], "r");
	516	if (infile == NULL) {
	517	fprintf(stderr, "docproc: ");
	518	perror(argv[2]);
	519	exit(2);
	520	}
	521
	522	if (strcmp("doc", argv[1]) == 0)
	523	{
	524	/* Need to do this in two passes.
	525	* First pass is used to collect all symbols exported
6dd16f44	526	* in the various files;
1da177e4	527	* Second pass generate the documentation.
6dd16f44	528	* This is required because some functions are declared
1da177e4 LT	529	* and exported in different files :-((
	530	*/
	531	/* Collect symbols */
	532	defaultline = noaction;
	533	internalfunctions = find_export_symbols;
	534	externalfunctions = find_export_symbols;
	535	symbolsonly = find_export_symbols;
	536	singlefunctions = noaction2;
e662af42	537	docsection = noaction2;
eda603f6	538	findall = find_all_symbols;
1da177e4 LT	539	parse_file(infile);
	540
	541	/* Rewind to start from beginning of file again */
	542	fseek(infile, 0, SEEK_SET);
	543	defaultline = printline;
	544	internalfunctions = intfunc;
	545	externalfunctions = extfunc;
	546	symbolsonly = printline;
	547	singlefunctions = singfunc;
e662af42	548	docsection = docsect;
eda603f6	549	findall = NULL;
1da177e4 LT	550
1da177e4 LT	551	parse_file(infile);
eda603f6 JB	552
	553	for (i = 0; i < all_list_len; i++) {
	554	if (!all_list[i])
	555	continue;
	556	fprintf(stderr, "Warning: didn't use docs for %s\n",
	557	all_list[i]);
	558	}
1da177e4 LT	559	}
	560	else if (strcmp("depend", argv[1]) == 0)
	561	{
	562	/* Create first part of dependency chain
	563	* file.tmpl */
	564	printf("%s\t", argv[2]);
	565	defaultline = noaction;
	566	internalfunctions = adddep;
	567	externalfunctions = adddep;
	568	symbolsonly = adddep;
	569	singlefunctions = adddep2;
e662af42	570	docsection = adddep2;
eda603f6	571	findall = adddep;
1da177e4 LT	572	parse_file(infile);
	573	printf("\n");
	574	}
	575	else
	576	{
	577	fprintf(stderr, "Unknown option: %s\n", argv[1]);
	578	exit(1);
	579	}
	580	fclose(infile);
	581	fflush(stdout);
	582	return exitstatus;
	583	}