78 lines
1.6 KiB
C
78 lines
1.6 KiB
C
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <md5.h>
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/* When this was written, bionic's md5.h did not define this. */
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#ifndef MD5_DIGEST_LENGTH
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#define MD5_DIGEST_LENGTH 16
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#endif
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static int usage()
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{
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fprintf(stderr,"md5 file ...\n");
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return -1;
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}
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static int do_md5(const char *path)
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{
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unsigned int i;
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int fd;
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MD5_CTX md5_ctx;
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unsigned char md5[MD5_DIGEST_LENGTH];
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fd = open(path, O_RDONLY);
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if (fd < 0) {
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fprintf(stderr,"could not open %s, %s\n", path, strerror(errno));
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return -1;
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}
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/* Note that bionic's MD5_* functions return void. */
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MD5_Init(&md5_ctx);
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while (1) {
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char buf[4096];
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ssize_t rlen;
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rlen = read(fd, buf, sizeof(buf));
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if (rlen == 0)
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break;
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else if (rlen < 0) {
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(void)close(fd);
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fprintf(stderr,"could not read %s, %s\n", path, strerror(errno));
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return -1;
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}
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MD5_Update(&md5_ctx, buf, rlen);
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}
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if (close(fd)) {
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fprintf(stderr,"could not close %s, %s\n", path, strerror(errno));
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return -1;
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}
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MD5_Final(md5, &md5_ctx);
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for (i = 0; i < (int)sizeof(md5); i++)
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printf("%02x", md5[i]);
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printf(" %s\n", path);
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return 0;
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}
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int md5_main(int argc, char *argv[])
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{
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int i, ret = 0;
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if (argc < 2)
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return usage();
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/* loop over the file args */
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for (i = 1; i < argc; i++) {
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if (do_md5(argv[i]))
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ret = 1;
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}
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return ret;
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}
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