99 lines
1.9 KiB
C
99 lines
1.9 KiB
C
#include "kernel/fs.h"
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#include "kernel/stat.h"
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#include "kernel/types.h"
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#include "user/user.h"
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int match_pattern(const char *name, const char *pattern) {
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const char *star = 0;
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const char *name_ptr = name;
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const char *pattern_ptr = pattern;
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while (1) {
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if (*pattern_ptr == '*') {
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star = pattern_ptr++;
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name_ptr = name;
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continue;
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}
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if (!*name)
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return (!*pattern_ptr || (star && !*++pattern_ptr));
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if (*pattern_ptr == '?' || *pattern_ptr == *name) {
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pattern_ptr++;
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name++;
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continue;
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}
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if (star) {
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pattern_ptr = star + 1;
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name = ++name_ptr;
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continue;
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}
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return 0;
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}
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}
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void find(char *path, char *pattern) {
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char buf[512], *p;
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int fd;
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struct dirent de;
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struct stat st;
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if ((fd = open(path, 0)) < 0) {
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fprintf(2, "find: cannot open %s\n", path);
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return;
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}
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if (fstat(fd, &st) < 0) {
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fprintf(2, "find: cannot stat %s\n", path);
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close(fd);
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return;
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}
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if (st.type != T_DIR) {
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fprintf(2, "find: %s is not a directory\n", path);
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close(fd);
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return;
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}
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if (strlen(path) + 1 + DIRSIZ + 1 > sizeof buf) {
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fprintf(2, "find: path too long\n");
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close(fd);
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return;
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}
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strcpy(buf, path);
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p = buf + strlen(buf);
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*p++ = '/';
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while (read(fd, &de, sizeof(de)) == sizeof(de)) {
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if (de.inum == 0 || !strcmp(de.name, ".") || !strcmp(de.name, ".."))
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continue;
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memmove(p, de.name, DIRSIZ);
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p[DIRSIZ] = 0;
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if (stat(buf, &st) < 0) {
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fprintf(2, "find: cannot stat %s\n", buf);
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continue;
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}
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if (st.type == T_DIR) {
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find(buf, pattern);
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} else if (st.type == T_FILE) {
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if (match_pattern(de.name, pattern)) {
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fprintf(1, "%s\n", buf);
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}
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}
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}
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close(fd);
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}
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int main(int argc, char *argv[]) {
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if (argc != 3) {
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fprintf(2, "Usage: find <path> <pattern>\n");
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exit(1);
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}
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find(argv[1], argv[2]);
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exit(0);
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}
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