diff options
Diffstat (limited to 'src/printf.c')
| -rw-r--r-- | src/printf.c | 45 |
1 files changed, 41 insertions, 4 deletions
diff --git a/src/printf.c b/src/printf.c index 3781eff44..ca13af365 100644 --- a/src/printf.c +++ b/src/printf.c @@ -101,11 +101,48 @@ static int exit_status; char *program_name; static void -usage () +usage (status) + int status; { - fprintf (stderr, "Usage: %s [{--help,--version}] format [argument...]\n", - program_name); - exit (1); + fprintf (status == 0 ? stdout : stderr, "\ +Usage: %s FORMAT [ARGUMENT]...\n\ + or: %s OPTION\n\ +", + program_name, program_name); + + if (status != 0) + fprintf (stderr, "\nTry `%s --help' for more information.\n", + program_name); + else + + printf ("\ +\n\ + --help display this help and exit\n\ + --version output version information and exit\n\ +\n\ +FORMAT controls the output as in C printf. Interpreted sequences are:\n\ +\n\ + \\\" double quote\n\ + \\0NNN character with octal value NNN (0 to 3 digits)\n\ + \\\\ backslash\n\ + \\a alert (BEL)\n\ + \\b backspace\n\ + \\c produce no further output\n\ + \\f form feed\n\ + \\n new line\n\ + \\r carriage return\n\ + \\t horizontal tab\n\ + \\v vertical tab\n\ + \\xNNN character with hexadecimal value NNN (1 to 3 digits)\n\ +\n\ + %%%% a single %%\n\ + %%b ARGUMENT as a string with `\\' escapes interpreted\n\ +\n\ +and all C format specifications ending with one of diouxXfeEgGcs, with\n\ +ARGUMENTs converted to proper type first. Variable widths are handled.\n\ +"); + + exit (status); } void |