7-4.c

《Linux应用开发技术详解》附书光盘中的例程。

/*
    The following sample program searches the current directory for each of the arguments supplied on the command line.
*/
#include <dirent.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>

static void lookup(const char *arg)
{
    DIR *dirp;
    struct dirent *dp;

    if ((dirp = opendir(".")) == NULL) {
        perror("couldn't open '.'");
        return;
    }

    do {
        errno = 0;
        if ((dp = readdir(dirp)) != NULL) {
            if (strcmp(dp->d_name, arg) != 0)
                continue;
            (void) printf("found %s\n", arg);
            (void) closedir(dirp);
                return;
        }
    } while (dp != NULL);

    if (errno != 0)
        perror("error reading directory");
    else
        (void) printf("failed to find %s\n", arg);
    (void) closedir(dirp);
    return;
}

int main(int argc, char *argv[])
{
    int i;
    for (i = 1; i < argc; i++)
        lookup(argv[i]);
    return (0);
}