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binand/largest.c

Created October 17, 2016 03:02
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Locates the largest file (files) in a directory and its subdirectories passed as argument.
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largest.c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ftw.h>
struct currentry {
char **path;
int cnt;
size_t size;
};
struct currentry ce;
int record_largest(const char *, const struct stat *, int);
int main(int ac, char **av) {
int i = 0;
if (ac < 1) {
fprintf(stderr, "Usage: largest <directory>\n");
exit(1);
}
ce.cnt = 0;
ce.size = 0;
ce.path = NULL;
ftw(av[1], record_largest, 100);
if (ce.cnt == 0) {
printf("No files found?\n");
exit(1);
}
printf("\nLargest file size: %lu\n\n", ce.size);
for (i = 0; i < ce.cnt; i++) {
printf("\tFile[%d]: %s\n", i + 1, ce.path[i]);
}
putchar('\n');
exit(0);
}
int record_largest(const char *fpath, const struct stat *sb, int typeflag) {
int i;
if (typeflag != FTW_F) {
return 0;
}
if (ce.path == NULL) {
ce.size = sb->st_size;
ce.cnt = 1;
ce.path = malloc(sizeof *(ce.path));
ce.path[0] = malloc(strlen(fpath) + 1);
strcpy(ce.path[0], fpath);
return 0;
}
if (sb->st_size > ce.size) {
for (i = 0; i < ce.cnt; i++) {
free(ce.path[i]);
}
free(ce.path);
ce.size = sb->st_size;
ce.cnt = 1;
ce.path = malloc(sizeof *(ce.path));
ce.path[0] = malloc(strlen(fpath) + 1);
strcpy(ce.path[0], fpath);
} else if (sb->st_size == ce.size) {
ce.path[ce.cnt] = malloc(strlen(fpath) + 1);
strcpy(ce.path[ce.cnt], fpath);
ce.cnt++;
}
return 0;
}
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