Only occurs if no arguments were provided directly. Arguments can be separated by any amount of valid whitespace. This allows for piping into pacman from other programs or from itself, e.g.:

 pacman -Qdtq | pacman -Rs

This is better than using xargs, as xargs will not reconnect stdin to the terminal. The above operation performed using xargs would require the --noconfirm flag to be passed to pacman.

Signed-off-by: Dave Reisner <d@falconindy.com> --- Resending as per Allan's request with modifications from the origin 7/24 submission.

Changes: * Check return value of freopen * Assign '\0' instead of 0 to null terminate * Use post-increment instead of pre-increment * Check for buffer overflow condition (not convinced my method is reasonable) * Dynamically find stdin's FD instead of assuming it's 1 * Use PATH_MAX instead of BUFSIZ

Concerns: * The verbiage I've used in the new strings is probably not ideal.

 src/pacman/pacman.c |   33 +++++++++++++++++++++++++++++++++  1 files changed, 33 insertions(+), 0 deletions(-)

diff --git a/src/pacman/pacman.c b/src/pacman/pacman.c index 15abecc..e078aab 100644 --- a/src/pacman/pacman.c +++ b/src/pacman/pacman.c @@ -26,6 +26,7 @@  #define PACKAGE_VERSION GIT_VERSION  #endif

+#include <ctype.h> /* isspace */  #include <stdlib.h> /* atoi */  #include <stdio.h>  #include <limits.h> @@ -1305,6 +1306,38 @@ int main(int argc, char *argv[])                cleanup(ret);        }

+       /* read package arguments from stdin if we have none yet */ +       if(!pm_targets && !isatty(fileno(stdin))) { We talked on IRC, but probably can kill the pm_targets check- why

On Thu, Nov 4, 2010 at 3:05 PM, Dave Reisner <d@falconindy.com> wrote: limit people if we are going to allow this?

+               char line[PATH_MAX]; +               int i = 0; +               while(i < PATH_MAX && (line[i] = fgetc(stdin)) != EOF) { +                       if(isspace((unsigned char)line[i])) { +                               line[i] = '\0'; +                               /* avoid adding zero length arg when multiple spaces separate args */ +                               if(i > 0) { +                                       pm_targets = alpm_list_add(pm_targets, strdup(line)); +                                       i = 0; +                               } +                       } else { +                               i++; +                       } +               } +               /* check for buffer overflow */ +               if (i >= PATH_MAX) { +                       pm_printf(PM_LOG_ERROR, _("buffer overflow detected in arg parsing\n")); How about "could not process stdin: argument greater than %d characters\n" or something (obv passing PATH_MAX along to the printf function)?

+                       cleanup(EXIT_FAILURE); +               } + +               /* end of stream -- check for data still in line buffer */ +               if(i > 0) { Do we know line is going to end in a ptr to a null char? Or do you have to do that here too like you did above.

+                       pm_targets = alpm_list_add(pm_targets, strdup(line)); +               } +               if (!freopen(ctermid(NULL), "r", stdin)) { +                       pm_printf(PM_LOG_ERROR, _("failed to reopen stdin for reading: (%s)\n"), +                                       strerror(errno)); If it is a true error, should we cleanup() here too? Otherwise make this a PM_LOG_WARN probably.

+               } +       } +        /* parse the config file */        ret = parseconfig(config->configfile);        if(ret != 0) { --

Otherwise, this + documentation in pacman man page would be kickass and ready to commit. -Dan