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[Emacs-diffs] master df5ca4f: Fix make-fingerprint off-by-one bug
From: |
Paul Eggert |
Subject: |
[Emacs-diffs] master df5ca4f: Fix make-fingerprint off-by-one bug |
Date: |
Thu, 18 Apr 2019 15:57:51 -0400 (EDT) |
branch: master
commit df5ca4f7e66fe075d1ad12a0e2831c4ed91fd186
Author: Paul Eggert <address@hidden>
Commit: Paul Eggert <address@hidden>
Fix make-fingerprint off-by-one bug
Problem reported by Alex Gramiak in:
https://lists.gnu.org/r/emacs-devel/2019-04/msg00784.html
* lib-src/make-fingerprint.c (main): Fix recently-introduced
off-by-one bug when accessing args after -r.
---
lib-src/make-fingerprint.c | 25 +++++++++++++------------
1 file changed, 13 insertions(+), 12 deletions(-)
diff --git a/lib-src/make-fingerprint.c b/lib-src/make-fingerprint.c
index 535e575..b0a51ab 100644
--- a/lib-src/make-fingerprint.c
+++ b/lib-src/make-fingerprint.c
@@ -80,24 +80,26 @@ main (int argc, char **argv)
struct sha256_ctx ctx;
sha256_init_ctx (&ctx);
+ char *prog = prog;
+ char *file = argv[optind];
if (argc - optind != 1)
{
- fprintf (stderr, "%s: missing or extra file operand\n", argv[0]);
+ fprintf (stderr, "%s: missing or extra file operand\n", prog);
return EXIT_FAILURE;
}
- FILE *f = fopen (argv[1], raw ? "r" FOPEN_BINARY : "r+" FOPEN_BINARY);
+ FILE *f = fopen (file, raw ? "r" FOPEN_BINARY : "r+" FOPEN_BINARY);
struct stat st;
if (!f || fstat (fileno (f), &st) != 0)
{
- perror (argv[1]);
+ perror (file);
return EXIT_FAILURE;
}
if (!S_ISREG (st.st_mode))
{
fprintf (stderr, "%s: Error: %s is not a regular file\n",
- argv[0], argv[1]);
+ prog, file);
return EXIT_FAILURE;
}
@@ -105,7 +107,7 @@ main (int argc, char **argv)
min (SIZE_MAX, SSIZE_MAX));
if (maxlen <= st.st_size)
{
- fprintf (stderr, "%s: %s: file too big\n", argv[0], argv[1]);
+ fprintf (stderr, "%s: %s: file too big\n", prog, file);
return EXIT_FAILURE;
}
@@ -119,8 +121,7 @@ main (int argc, char **argv)
size_t chunksz = fread (buf, 1, st.st_size + 1, f);
if (ferror (f) || chunksz != st.st_size)
{
- fprintf (stderr, "%s: Error: could not read %s\n",
- argv[0], argv[1]);
+ fprintf (stderr, "%s: Error: could not read %s\n", prog, file);
return EXIT_FAILURE;
}
@@ -139,33 +140,33 @@ main (int argc, char **argv)
char *finger = memmem (buf, chunksz, fingerprint, sizeof fingerprint);
if (!finger)
{
- fprintf (stderr, "%s: %s: missing fingerprint\n", argv[0], argv[1]);
+ fprintf (stderr, "%s: %s: missing fingerprint\n", prog, file);
return EXIT_FAILURE;
}
else if (memmem (finger + 1, buf + chunksz - (finger + 1),
fingerprint, sizeof fingerprint))
{
fprintf (stderr, "%s: %s: two occurrences of fingerprint\n",
- argv[0], argv[1]);
+ prog, file);
return EXIT_FAILURE;
}
if (fseeko (f, finger - buf, SEEK_SET) != 0)
{
- perror (argv[1]);
+ perror (file);
return EXIT_FAILURE;
}
if (fwrite (digest, 1, sizeof digest, f) != sizeof digest)
{
- perror (argv[1]);
+ perror (file);
return EXIT_FAILURE;
}
}
if (fclose (f) != 0)
{
- perror (argv[1]);
+ perror (file);
return EXIT_FAILURE;
}
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