From 7634b55f27ad483ec634ba9defac93872e3a329f Mon Sep 17 00:00:00 2001 From: Rob Landley Date: Thu, 29 Nov 2007 17:49:50 -0600 Subject: Add loopfiles() function, make catv use it. --- lib/lib.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) (limited to 'lib/lib.c') diff --git a/lib/lib.c b/lib/lib.c index 5d01efc9..6aaf7b00 100644 --- a/lib/lib.c +++ b/lib/lib.c @@ -545,3 +545,26 @@ void xpidfile(char *name) xwrite(fd, spid, sprintf(spid, "%ld\n", (long)getpid())); close(fd); } + +// Iterate through an array of files, opening each one (read only) and +// calling a function on that filehandle and name. The special filename +// "-" means stdin. An empty argument list calls function() on stdin. +void loopfiles(char **argv, void (*function)(int fd, char *name)) +{ + int fd; + + // If no arguments, read from stdin. + if (!*argv) function(0, *argv); + else do { + // Filename "-" means read from stdin. + // Inability to open a file prints a warning, but doesn't exit. + + if (!strcmp(*argv,"-")) fd=0; + else if (0>(fd = open(*argv, O_RDONLY))) { + perror_msg("%s",*argv); + toys.exitval = 1; + } + function(fd, *argv); + close(fd); + } while (*++argv); +} -- cgit v1.2.3