read-exif

#include <stdio.h>
#include <string.h>
#include <libexif/exif-data.h>

static void trim_spaces(char *buf){
    char *s = buf-1;

    for (; *buf; ++buf) {
        if (*buf != ' ') s = buf;
    }
    *++s = 0; /* nul terminate the string on the first of the final spaces */
}

static char* read_tag(ExifData *ed, ExifIfd eid, ExifTag tag){
    static char result[1024];
    ExifEntry *entry = exif_content_get_entry(ed->ifd[eid], tag);

    if (entry){
        char buf[1024];

        exif_entry_get_value(entry, buf, sizeof(buf));
        trim_spaces(buf);

        if (*buf) strcpy(result, buf);
        else strcpy(result, "NULL");
    }
    else strcpy(result, "NULL");

    return result;
}

int main(void){
    ExifData *ed;

    ed = exif_data_new_from_file("img01.jpg");

    if (!ed) {
        printf("File not readable or no EXIF data in file %s\n", argv[1]);
        return 1;
    }

    printf("Model : %s\n", read_tag(ed, EXIF_IFD_0, EXIF_TAG_MODEL));

    exif_data_unref(ed);
    return 0;
}