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| author | Eric Andersen <andersen@codepoet.org> | 2004-03-23 23:15:36 +0000 |
|---|---|---|
| committer | Eric Andersen <andersen@codepoet.org> | 2004-03-23 23:15:36 +0000 |
| commit | 97310d025390e96f34140cff13034fcd2b5da18f (patch) | |
| tree | be9b3406b9b0598d0bc42d6912a7855f7ee11819 | |
| parent | 6bb80870b839cc812d55b28f886bf3e001e4a00e (diff) | |
| download | busybox-97310d025390e96f34140cff13034fcd2b5da18f.tar.gz | |
Brian Pomerantz writes:
I've noticed a bug in the "autowidth" feature more, and is probably in
others. The call to the function get_terminal_width_height() passes
in a file descriptor but that file descriptor is never used, instead
the ioctl() is called with 0. In more_main() the call to
get_terminal_width_height() passes 0 as the file descriptor instead of
fileno(cin). This isn't a problem when you more a file (e.g. "more
/etc/passwd") but when you pipe a file to it (e.g. "cat /etc/passwd |
more") the size of the terminal cannot be determined because file
descriptor 0 is not a terminal. The fix is simple, I've attached a
patch for more.c and get_terminal_width_height.c.
BAPper
| -rw-r--r-- | coreutils/ls.c | 2 | ||||
| -rw-r--r-- | libbb/get_terminal_width_height.c | 2 | ||||
| -rw-r--r-- | util-linux/more.c | 4 |
3 files changed, 5 insertions, 3 deletions
diff --git a/coreutils/ls.c b/coreutils/ls.c index f7fa9a110..8b5065ac6 100644 --- a/coreutils/ls.c +++ b/coreutils/ls.c @@ -982,7 +982,7 @@ extern int ls_main(int argc, char **argv) #ifdef CONFIG_FEATURE_AUTOWIDTH /* Obtain the terminal width. */ - get_terminal_width_height(0, &terminal_width, NULL); + get_terminal_width_height(fileno(stdout), &terminal_width, NULL); /* Go one less... */ terminal_width--; #endif diff --git a/libbb/get_terminal_width_height.c b/libbb/get_terminal_width_height.c index ef90463fb..7a1af6dc1 100644 --- a/libbb/get_terminal_width_height.c +++ b/libbb/get_terminal_width_height.c @@ -36,7 +36,7 @@ void get_terminal_width_height(int fd, int *width, int *height) { struct winsize win = { 0, 0, 0, 0 }; #ifdef CONFIG_FEATURE_AUTOWIDTH - if (ioctl(0, TIOCGWINSZ, &win) != 0) { + if (ioctl(fd, TIOCGWINSZ, &win) != 0) { win.ws_row = 24; win.ws_col = 80; } diff --git a/util-linux/more.c b/util-linux/more.c index d7b7ce22f..04b29de17 100644 --- a/util-linux/more.c +++ b/util-linux/more.c @@ -67,6 +67,7 @@ extern int more_main(int argc, char **argv) int please_display_more_prompt = -1; struct stat st; FILE *file; + FILE *in_file = stdin; int len, page_height; argc--; @@ -78,6 +79,7 @@ extern int more_main(int argc, char **argv) cin = fopen(CURRENT_TTY, "r"); if (!cin) cin = bb_xfopen(CONSOLE_DEV, "r"); + in_file = cin; please_display_more_prompt = 0; #ifdef CONFIG_FEATURE_USE_TERMIOS getTermSettings(fileno(cin), &initial_settings); @@ -108,7 +110,7 @@ extern int more_main(int argc, char **argv) if(please_display_more_prompt>0) please_display_more_prompt = 0; - get_terminal_width_height(0, &terminal_width, &terminal_height); + get_terminal_width_height(fileno(in_file), &terminal_width, &terminal_height); if (terminal_height > 4) terminal_height -= 2; if (terminal_width > 0) |