87 lines
2.2 KiB
C
87 lines
2.2 KiB
C
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/* Simple untar example for POSIX systems using minitar. */
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#include <errno.h>
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#include <fcntl.h>
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#include <minitar.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <unistd.h>
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static int untar_file(const struct minitar_entry* entry, const void* buf)
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{
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int fd = open(entry->metadata.path, O_WRONLY | O_CREAT | O_EXCL | O_CLOEXEC, 0644);
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if (fd < 0) return 1;
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if (write(fd, buf, entry->metadata.size) < 0) return 1;
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if (fchmod(fd, entry->metadata.mode) < 0) return 1;
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return close(fd);
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}
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static int untar_directory(const struct minitar_entry* entry)
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{
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if (mkdir(entry->metadata.path, entry->metadata.mode) < 0) return 1;
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return 0;
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}
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int main(int argc, char** argv)
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{
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if (argc == 1)
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{
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fprintf(stderr, "Usage: %s [file]\n", argv[0]);
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return 1;
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}
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struct minitar mp;
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if (minitar_open(argv[1], &mp) != 0)
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{
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perror(argv[1]);
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return 1;
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}
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struct minitar_entry entry;
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do {
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if (minitar_read_entry(&mp, &entry) == 0)
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{
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if (entry.metadata.type == MTAR_DIRECTORY)
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{
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int status = untar_directory(&entry);
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if (status != 0)
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{
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fprintf(stderr, "Failed to create directory %s: %s\n", entry.metadata.path, strerror(errno));
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break;
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}
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printf("mkdir %s\n", entry.metadata.path);
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}
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else if (entry.metadata.type == MTAR_REGULAR)
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{
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char* ptr = (char*)malloc(entry.metadata.size);
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if (!ptr)
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{
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perror("malloc");
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break;
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}
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minitar_read_contents(&mp, &entry, ptr, entry.metadata.size);
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int status = untar_file(&entry, ptr);
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free(ptr);
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if (status != 0)
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{
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fprintf(stderr, "Failed to extract file %s: %s\n", entry.metadata.path, strerror(errno));
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break;
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}
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printf("untar %s\n", entry.metadata.path);
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}
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}
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else
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break;
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} while (1);
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minitar_close(&mp);
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}
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