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allf0.c
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allf0.c
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#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <string.h>
#include <dirent.h>
#include <sys/stat.h>
#include <errno.h>
#include <sys/param.h>
int main(int argc, char *argv[])
{
DIR *dirp;
struct dirent *direntp;
if(argc != 3) {
fprintf( stderr, "Usage: %s dir_name\n", argv[0]);
exit(1);
}
if ((dirp = opendir(argv[1])) == NULL) {
perror(argv[1]);
exit(2);
}
unsigned regcou=0, cou=0;
char *ppoi=NULL;
short extsz=strlen(argv[2]);
/* d_types:DT_BLK blockdev; DT_CHR chardev; DT_DIR straight dir; DT_FIFO namedpipe; DT_LNK symlink; DT_REG regular file; DT_SOCK UNIX domain socket; DT_UNKNOWN file type unknown */
while ((direntp = readdir(dirp)) != NULL)
if(direntp->d_type == DT_REG) {
regcou++;
if( (ppoi=strrchr(direntp->d_name, '.')) != NULL)
if(strncmp((ppoi+1), argv[2], extsz)==0)
cou++;
}
printf("In the directory \"%s\", of the total %u regular files, %u had the extension \"%s\".\n", argv[1], regcou, cou, argv[2]);
closedir(dirp);
return 0;
}