This commit is contained in:
Connor Lane Smith 2011-06-02 13:03:34 +01:00
parent 726973dcd5
commit 9f9ea07e6c
3 changed files with 88 additions and 2 deletions

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@ -5,8 +5,8 @@ LIB = util/afgets.o util/agetcwd.o util/concat.o util/enmasse.o util/eprintf.o \
util/recurse.o util/recurse.o
SRC = basename.c cat.c chmod.c chown.c date.c dirname.c echo.c false.c grep.c \ SRC = basename.c cat.c chmod.c chown.c date.c dirname.c echo.c false.c grep.c \
head.c ln.c ls.c mkdir.c mkfifo.c nl.c pwd.c rm.c sleep.c tail.c tee.c \ head.c ln.c ls.c mkdir.c mkfifo.c nl.c pwd.c rm.c sleep.c sort.c tail.c \
touch.c true.c wc.c tee.c touch.c true.c wc.c
OBJ = $(SRC:.c=.o) $(LIB) OBJ = $(SRC:.c=.o) $(LIB)
BIN = $(SRC:.c=) BIN = $(SRC:.c=)
MAN = $(SRC:.c=.1) MAN = $(SRC:.c=.1)

15
sort.1 Normal file
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@ -0,0 +1,15 @@
.TH NL 1 sbase\-VERSION
.SH NAME
sort \- sort lines
.SH SYNOPSIS
.B sort
.RB [ \-r ]
.RI [ file ...]
.SH DESCRIPTION
.B sort
writes the sorted concatenation of the given files to stdout. If no file is
given, sort reads from stdin.
.SH OPTIONS
.TP
.BI \-r
reverses the sort.

71
sort.c Normal file
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@ -0,0 +1,71 @@
/* See LICENSE file for copyright and license details. */
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "text.h"
#include "util.h"
static int linecmp(const char **, const char **);
static void getlines(FILE *, const char *);
static bool rflag = false;
static char **lines = NULL;
static long nlines = 0;
int
main(int argc, char *argv[])
{
char c;
long i;
FILE *fp;
while((c = getopt(argc, argv, "r")) != -1)
switch(c) {
case 'r':
rflag = true;
break;
default:
exit(EXIT_FAILURE);
}
if(optind == argc)
getlines(stdin, "<stdin>");
else for(; optind < argc; optind++) {
if(!(fp = fopen(argv[optind], "r")))
eprintf("fopen %s:", argv[optind]);
getlines(fp, argv[optind]);
fclose(fp);
}
qsort(lines, nlines, sizeof *lines, (int (*)(const void *, const void *))linecmp);
for(i = 0; i < nlines; i++) {
fputs(lines[i], stdout);
free(lines[i]);
}
free(lines);
return EXIT_SUCCESS;
}
void
getlines(FILE *fp, const char *str)
{
char *line = NULL;
size_t size = 0;
while(afgets(&line, &size, fp)) {
if(!(lines = realloc(lines, ++nlines * sizeof *lines)))
eprintf("realloc:");
if(!(lines[nlines-1] = malloc(strlen(line)+1)))
eprintf("malloc:");
strcpy(lines[nlines-1], line);
}
free(line);
}
int
linecmp(const char **a, const char **b)
{
return strcmp(*a, *b) * (rflag ? -1 : +1);
}