patch-2.0.21 linux/scripts/mkdep.c

• Lines: 276
• Date: Fri Sep 20 16:25:03 1996
• Orig file: v2.0.20/linux/scripts/mkdep.c
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v2.0.20/linux/scripts/mkdep.c linux/scripts/mkdep.c
@@ -0,0 +1,274 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <sys/fcntl.h>
+#include <sys/mman.h>
+
+char *filename, *command, __depname[256] = "\n\t@touch ";
+int needsconfig, hasconfig, hasdep;
+
+#define depname (__depname+9)
+
+struct path_struct {
+	int len;
+	char buffer[256-sizeof(int)];
+} path_array[2] = {
+	{ 23, "/usr/src/linux/include/" },
+	{  0, "" }
+};
+
+static void handle_include(int type, char *name, int len)
+{
+	int plen;
+	struct path_struct *path = path_array+type;
+
+	if (len == 14 && !memcmp(name, "linux/config.h", len))
+		hasconfig = 1;
+
+	plen = path->len;
+	memcpy(path->buffer+plen, name, len);
+	len += plen;
+	path->buffer[len] = '\0';
+	if (access(path->buffer, F_OK))
+		return;
+
+	if (!hasdep) {
+		hasdep = 1;
+		printf("%s:", depname);
+	}
+	printf(" \\\n   %s", path->buffer);
+}
+
+static void handle_config(void)
+{
+	needsconfig = 1;
+	if (!hasconfig)
+		fprintf(stderr,
+			"%s needs config but has not included config file\n",
+			filename);
+}
+
+#if defined(__alpha__) || defined(__i386__)
+#define LE_MACHINE
+#endif
+
+#ifdef LE_MACHINE
+#define first_byte(x) current = (unsigned char) x; x >>= 8;
+#else
+#define first_byte(x) current = x >> 8*(sizeof(unsigned long)-1); x <<= 8;
+#endif
+
+#define GETNEXT { \
+if (!__buf) { \
+	__buf = *(unsigned long *) next; \
+	if (!__buf) \
+		break; \
+} first_byte(__buf); next++; }
+#define CASE(c,label) if (current == c) goto label
+#define NOTCASE(c,label) if (current != c) goto label
+
+static void state_machine(char *next)
+{
+	for(;;) {
+	unsigned long __buf = 0;
+	unsigned char current;
+
+normal:
+	GETNEXT
+__normal:
+	CASE('/',slash);
+	CASE('"',string);
+	CASE('\'',char_const);
+	CASE('#',preproc);
+	goto normal;
+
+slash:
+	GETNEXT
+	CASE('*',comment);
+	goto __normal;
+
+string:
+	GETNEXT
+	CASE('"',normal);
+	NOTCASE('\\',string);
+	GETNEXT
+	goto string;
+
+char_const:
+	GETNEXT
+	CASE('\'',normal);
+	NOTCASE('\\',char_const);
+	GETNEXT
+	goto char_const;
+
+comment:
+	GETNEXT
+__comment:
+	NOTCASE('*',comment);
+	GETNEXT
+	CASE('/',normal);
+	goto __comment;
+
+preproc:
+	GETNEXT
+	CASE('\n',normal);
+	CASE(' ',preproc);
+	CASE('\t',preproc);
+	CASE('i',i_preproc);
+	GETNEXT
+
+skippreproc:
+	CASE('\n',normal);
+	CASE('\\',skippreprocslash);
+	GETNEXT
+	goto skippreproc;
+
+skippreprocslash:
+	GETNEXT;
+	GETNEXT;
+	goto skippreproc;
+
+i_preproc:
+	GETNEXT
+	CASE('f',if_line);
+	NOTCASE('n',skippreproc);
+	GETNEXT
+	NOTCASE('c',skippreproc);
+	GETNEXT
+	NOTCASE('l',skippreproc);
+	GETNEXT
+	NOTCASE('u',skippreproc);
+	GETNEXT
+	NOTCASE('d',skippreproc);
+	GETNEXT
+	NOTCASE('e',skippreproc);
+
+/* "# include" found */
+include_line:
+	GETNEXT
+	CASE('\n',normal);
+	CASE('<', std_include_file);
+	NOTCASE('"', include_line);
+
+/* "local" include file */
+{
+	char *incname = next;
+local_include_name:
+	GETNEXT
+	CASE('\n',normal);
+	NOTCASE('"', local_include_name);
+	handle_include(1, incname, next-incname-1);
+	goto skippreproc;
+}
+
+/* <std> include file */
+std_include_file:
+{
+	char *incname = next;
+std_include_name:
+	GETNEXT
+	CASE('\n',normal);
+	NOTCASE('>', std_include_name);
+	handle_include(0, incname, next-incname-1);
+	goto skippreproc;
+}
+
+if_line:
+	if (needsconfig)
+		goto skippreproc;
+if_start:
+	if (!memcmp("CONFIG_", next, 7)) {
+		handle_config();
+		goto skippreproc;
+	}
+	GETNEXT
+	CASE('\n', normal);
+	CASE('_', if_middle);
+	if (current >= 'a' && current <= 'z')
+		goto if_middle;
+	if (current < 'A' || current > 'Z')
+		goto if_start;
+if_middle:
+	GETNEXT
+	CASE('\n', normal);
+	CASE('_', if_middle);
+	if (current >= 'a' && current <= 'z')
+		goto if_middle;
+	if (current < 'A' || current > 'Z')
+		goto if_start;
+	goto if_middle;
+	}
+}
+
+static void do_depend(void)
+{
+	char *map;
+	int mapsize;
+	int pagesizem1 = getpagesize()-1;
+	int fd = open(filename, O_RDONLY);
+	struct stat st;
+
+	if (fd < 0) {
+		perror("mkdep: open");
+		return;
+	}
+	fstat(fd, &st);
+	mapsize = st.st_size + 2*sizeof(unsigned long);
+	mapsize = (mapsize+pagesizem1) & ~pagesizem1;
+	map = mmap(NULL, mapsize, PROT_READ, MAP_PRIVATE, fd, 0);
+	if (-1 == (long)map) {
+		perror("mkdep: mmap");
+		close(fd);
+		return;
+	}
+	close(fd);
+	state_machine(map);
+	munmap(map, mapsize);
+	if (hasdep)
+		puts(command);
+}
+
+int main(int argc, char **argv)
+{
+	int len;
+	char * hpath;
+
+	hpath = getenv("HPATH");
+	if (!hpath)
+		hpath = "/usr/src/linux/include";
+	len = strlen(hpath);
+	memcpy(path_array[0].buffer, hpath, len);
+	if (len && hpath[len-1] != '/') {
+		path_array[0].buffer[len] = '/';
+		len++;
+	}
+	path_array[0].buffer[len] = '\0';
+	path_array[0].len = len;
+
+	while (--argc > 0) {
+		int len;
+		char *name = *++argv;
+
+		filename = name;
+		len = strlen(name);
+		memcpy(depname, name, len+1);
+		command = __depname;
+		if (len > 2 && name[len-2] == '.') {
+			switch (name[len-1]) {
+				case 'c':
+				case 'S':
+					depname[len-1] = 'o';
+					command = "";
+			}
+		}
+		needsconfig = hasconfig = hasdep = 0;
+		do_depend();
+		if (hasconfig && !needsconfig)
+			fprintf(stderr, "%s doesn't need config\n", filename);
+	}
+	return 0;
+}