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add head

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This commit is contained in:
Connor Lane Smith 2011-05-25 11:42:17 +01:00
parent a9c970b973
commit 262f357fdd
7 changed files with 77 additions and 8 deletions
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4
Makefile
View File

@ -1,8 +1,8 @@
include config.mk
LIB = util/enmasse.o util/eprintf.o util/recurse.o
SRC = basename.c cat.c chown.c date.c dirname.c echo.c false.c grep.c ln.c \
mkfifo.c pwd.c rm.c sleep.c tee.c touch.c true.c wc.c
SRC = basename.c cat.c chown.c date.c dirname.c echo.c false.c grep.c head.c \
ln.c mkfifo.c pwd.c rm.c sleep.c tee.c touch.c true.c wc.c
OBJ = $(SRC:.c=.o) $(LIB)
BIN = $(SRC:.c=)
MAN = $(SRC:.c=.1)

2
chown.c
View File

@ -49,7 +49,7 @@ main(int argc, char *argv[])
if(errno != 0)
eprintf("getgrnam %s:", group);
else if(!gr)
eprintf("getgrnam %s: no such user\n", group);
eprintf("getgrnam %s: no such group\n", group);
}
for(; optind < argc; optind++)
chownpwgr(argv[optind]);

6
date.c
View File

@ -8,7 +8,7 @@
int
main(int argc, char *argv[])
{
char buf[BUFSIZ], c;
char buf[BUFSIZ], c, *end;
char *fmt = "%c";
struct tm *now = NULL;
time_t t;
@ -17,7 +17,9 @@ main(int argc, char *argv[])
while((c = getopt(argc, argv, "d:")) != -1)
switch(c) {
case 'd':
t = strtol(optarg, NULL, 0);
t = strtol(optarg, &end, 0);
if(*end != '\0')
eprintf("%s: not a number\n", optarg);
break;
default:
exit(EXIT_FAILURE);

15
head.1 Normal file
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@ -0,0 +1,15 @@
.TH HEAD 1 sbase\-VERSION
.SH NAME
head \- output first part of files
.SH SYNOPSIS
.B head
.RB [ \-n
.IR lines ]
.RI [ file ...]
.SH DESCRIPTION
.B head
writes the first 10 lines of each file to stdout.
.SH OPTIONS
.TP
.BI \-n " lines"
outputs the given number of lines.

47
head.c Normal file
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@ -0,0 +1,47 @@
/* See LICENSE file for copyright and license details. */
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "util.h"
static void head(FILE *, const char *, long);
int
main(int argc, char *argv[])
{
char *end, c;
long n = 10;
FILE *fp;
while((c = getopt(argc, argv, "n:")) != -1)
switch(c) {
case 'n':
n = strtol(optarg, &end, 0);
if(*end != '\0')
eprintf("%s: not a number\n", optarg);
break;
default:
exit(EXIT_FAILURE);
}
if(optind == argc)
head(stdin, "<stdin>", n);
else for(; optind < argc; optind++) {
if(!(fp = fopen(argv[optind], "r")))
eprintf("fopen %s:", argv[optind]);
head(fp, argv[optind], n);
fclose(fp);
}
return EXIT_SUCCESS;
}
void
head(FILE *fp, const char *str, long n)
{
char buf[BUFSIZ];
int i;
for(i = 0; i < n && fgets(buf, sizeof buf, fp); i++)
fputs(buf, stdout);
if(ferror(fp))
eprintf("%s: read error:", str);
}

5
sleep.c
View File

@ -6,6 +6,7 @@
int
main(int argc, char *argv[])
{
char *end;
unsigned int seconds;
if(getopt(argc, argv, "") != -1)
@ -13,7 +14,9 @@ main(int argc, char *argv[])
if(optind != argc-1)
eprintf("usage: %s seconds\n", argv[0]);
seconds = atoi(argv[optind]);
seconds = strtol(argv[optind], &end, 0);
if(*end != '\0')
eprintf("%s: not a number\n", argv[optind]);
while((seconds = sleep(seconds)) > 0)
;
return EXIT_SUCCESS;

6
touch.c
View File

@ -17,7 +17,7 @@ static time_t t;
int
main(int argc, char *argv[])
{
char c;
char *end, c;
t = time(NULL);
while((c = getopt(argc, argv, "ct:")) != -1)
@ -26,7 +26,9 @@ main(int argc, char *argv[])
cflag = true;
break;
case 't':
t = strtol(optarg, NULL, 0);
t = strtol(optarg, &end, 0);
if(*end != '\0')
eprintf("%s: not a number\n", optarg);
break;
default:
exit(EXIT_FAILURE);