diff options
Diffstat (limited to 'coreutils/head.c')
| -rw-r--r-- | coreutils/head.c | 28 |
1 files changed, 15 insertions, 13 deletions
diff --git a/coreutils/head.c b/coreutils/head.c index 7f08a80..4e58bdc 100644 --- a/coreutils/head.c +++ b/coreutils/head.c @@ -26,10 +26,12 @@ #include <stdio.h> const char head_usage[] = -"Usage: head [FILE]...\n\n" +"head [OPTION] [FILE]...\n\n" "Print first 10 lines of each FILE to standard output.\n" "With more than one FILE, precede each with a header giving the\n" -"file name. With no FILE, or when FILE is -, read standard input.\n"; +"file name. With no FILE, or when FILE is -, read standard input.\n\n" +"Options:\n" +"\t-n NUM\t\tPrint first NUM lines instead of first 10\n"; int head(int len, FILE *src) @@ -49,22 +51,22 @@ head(int len, FILE *src) int head_main(int argc, char **argv) { - int i = 1; char opt; - int len = 10; - - /* 1st option is potentially special */ - if ((argc > 1) && (argv[1][0] == '-') && isDecimal(argv[1][1])) { - int tmplen = atoi(&argv[1][1]); - if (tmplen) { len = tmplen; } - i = 2; - } + int len = 10, tmplen, i; /* parse argv[] */ - for ( ; i < argc; i++) { + for (i = 1; i < argc; i++) { if (argv[i][0] == '-') { opt = argv[i][1]; switch (opt) { + case 'n': + tmplen = 0; + if (i++ < argc) + tmplen = atoi(argv[i]); + if (tmplen < 1) + usage(head_usage); + len = tmplen; + break; case '-': case 'h': usage(head_usage); @@ -103,4 +105,4 @@ head_main(int argc, char **argv) exit(0); } -/* $Id: head.c,v 1.4 1999/12/17 18:52:06 erik Exp $ */ +/* $Id: head.c,v 1.5 2000/01/23 18:19:02 erik Exp $ */ |