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| author | Denis Vlasenko <vda.linux@googlemail.com> | 2008-03-24 16:28:47 +0000 |
|---|---|---|
| committer | Denis Vlasenko <vda.linux@googlemail.com> | 2008-03-24 16:28:47 +0000 |
| commit | e9d67a81c8c8ca0d256670929353b9a8d3b18563 (patch) | |
| tree | 27075fa906345b7765f9a0272c3ec075923b3686 | |
| parent | 7fe0ebac5f22a810ee25ea182582ee71d6bf86b2 (diff) | |
| download | busybox-e9d67a81c8c8ca0d256670929353b9a8d3b18563.tar.gz | |
diff: fix small bug; don't make a copy for "/dev/null" case
| -rw-r--r-- | editors/diff.c | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/editors/diff.c b/editors/diff.c index 7a6422564..27c8365cc 100644 --- a/editors/diff.c +++ b/editors/diff.c @@ -283,7 +283,7 @@ static char *make_temp(FILE *f, struct stat *sb) char *name; int fd; - if (S_ISREG(sb->st_mode)) + if (S_ISREG(sb->st_mode) || S_ISBLK(sb->st_mode)) return NULL; name = xstrdup("/tmp/difXXXXXX"); fd = mkstemp(name); @@ -312,9 +312,15 @@ static NOINLINE int files_differ(FILE *f1, FILE *f2, int flags) { size_t i, j; + /* Prevent making copies for "/dev/null" (too common) */ + tempname1 = tempname2 = NULL; + if (flags & (D_EMPTY1 | D_EMPTY2)) { + return 1; + } + /* Deal with input from pipes etc */ tempname1 = make_temp(f1, &stb1); tempname2 = make_temp(f2, &stb2); - if ((flags & (D_EMPTY1 | D_EMPTY2)) || stb1.st_size != stb2.st_size) { + if (stb1.st_size != stb2.st_size) { return 1; } while (1) { @@ -631,8 +637,8 @@ static NOINLINE void check(FILE *f1, FILE *f2) J[i] = 0; if (c != '\n' && c != EOF) ctold += skipline(f1); -// BUG? Should be "if (d != '\n' && d != EOF)" ? - if (d != '\n' && c != EOF) +/* was buggy? "if (d != '\n' && c != EOF)" */ + if (d != '\n' && d != EOF) ctnew += skipline(f2); break; } |