sort: add -k, fix -u
Options that are specific to a single key definition are not supported (e.g. "sort -k 2,3n -k 4,4"). Should you try to specify such definitions, sort will return with EXIT_FAILURE and an error message. Instead, all key definitions exclusively use the global settings. It always behaves like -b was set.
This commit is contained in:
Jakob Kramer
sin
parent
02d91696b4
commit
98a12cc146
19
sort.1
19
sort.1
@ -4,6 +4,9 @@ sort \- sort lines
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.SH SYNOPSIS
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.B sort
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.RB [ \-nru ]
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.RB [ \-k
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.I key
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.R ]...
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.RI [ file ...]
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.SH DESCRIPTION
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.B sort
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@ -18,4 +21,18 @@ perform a numeric sort.
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reverses the sort.
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.TP
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.B \-u
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prints repeated lines only once.
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prints equal lines only once.
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.TP
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.B \-k key
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specifies a key definition of the form \fBS\fR[.\fBs\fR][,\fBE\fR[.\fBe\fR]],
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where
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.B S,
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.B s,
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.B E,
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and
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.B e
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are the starting column, starting character in that column, ending column and
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the ending character of that column respectively. If they are not specified,
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s refers to the first character of the specified starting column, E refers to
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the last column of every line, and e refers to the last character of that last
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column.
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173
sort.c
173
sort.c
@ -1,4 +1,5 @@
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/* See LICENSE file for copyright and license details. */
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#include <ctype.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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@ -7,7 +8,28 @@
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#include "text.h"
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#include "util.h"
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struct keydef {
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unsigned start_column;
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unsigned end_column;
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unsigned start_char;
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unsigned end_char;
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};
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struct kdlist {
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struct keydef keydef;
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struct kdlist *next;
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};
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static struct kdlist *head = NULL;
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static struct kdlist *curr = NULL;
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static void addkeydef(char *);
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static void freelist(void);
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static int linecmp(const char **, const char **);
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static char *next_nonblank(char *);
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static char *next_blank(char *);
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static int parse_keydef(struct keydef *, char *);
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static char *columns(char *, const struct keydef *);
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static bool rflag = false;
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static bool uflag = false;
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@ -18,7 +40,7 @@ static struct linebuf linebuf = EMPTY_LINEBUF;
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static void
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usage(void)
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{
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eprintf("usage: %s [-nru] [file...]\n", argv0);
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enprintf(2, "usage: %s [-nru] [-k def]... [file...]\n", argv0);
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}
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int
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@ -37,15 +59,20 @@ main(int argc, char *argv[])
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case 'u':
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uflag = true;
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break;
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case 'k':
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addkeydef(EARGF(usage()));
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break;
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default:
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usage();
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} ARGEND;
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addkeydef("1");
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if(argc == 0) {
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getlines(stdin, &linebuf);
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} else for(; argc > 0; argc--, argv++) {
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if(!(fp = fopen(argv[0], "r"))) {
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weprintf("fopen %s:", argv[0]);
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enprintf(2, "fopen %s:", argv[0]);
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continue;
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}
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getlines(fp, &linebuf);
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@ -55,24 +82,144 @@ main(int argc, char *argv[])
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(int (*)(const void *, const void *))linecmp);
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for(i = 0; i < linebuf.nlines; i++) {
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if(!uflag || i == 0 || strcmp(linebuf.lines[i],
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linebuf.lines[i-1]) != 0) {
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if(!uflag || i == 0 || linecmp((const char **)&linebuf.lines[i],
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(const char **)&linebuf.lines[i-1])) {
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fputs(linebuf.lines[i], stdout);
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}
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}
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freelist();
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return EXIT_SUCCESS;
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}
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int
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linecmp(const char **a, const char **b)
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static void
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addkeydef(char *def)
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{
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if (nflag) {
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if (rflag)
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return strtoul(*b, 0, 10) - strtoul(*a, 0, 10);
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else
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return strtoul(*a, 0, 10) - strtoul(*b, 0, 10);
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}
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return strcmp(*a, *b) * (rflag ? -1 : +1);
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struct kdlist *node;
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node = malloc(sizeof(*node));
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if(!node)
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enprintf(2, "malloc:");
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if(!head)
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head = node;
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if(parse_keydef(&node->keydef, def))
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enprintf(2, "parse_keydef:");
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if(curr)
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curr->next = node;
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node->next = NULL;
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curr = node;
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}
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static void
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freelist(void)
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{
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struct kdlist *node;
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struct kdlist *tmp;
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for(node = head; node; node = tmp) {
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tmp = node->next;
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free(node);
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}
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}
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static int
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linecmp(const char **a, const char **b)
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{
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char *s1, *s2;
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int res = 0;
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struct kdlist *node;
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for(node = head; node && res == 0; node = node->next) {
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s1 = columns((char *)*a, &node->keydef);
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s2 = columns((char *)*b, &node->keydef);
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/* don't consider modifiers if it's the default key
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* definition that was implicitly added */
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/* if -u is given, don't use default */
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if(uflag && !(node == head) && !node->next)
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res = 0;
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else if(!(node == head) && !node->next)
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res = strcmp(s1, s2);
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else if(nflag)
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res = strtoul(s1, 0, 10) - strtoul(s2, 0, 10);
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else
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res = strcmp(s1, s2);
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free(s1);
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free(s2);
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}
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return rflag ? -res : res;
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}
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static int
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parse_keydef(struct keydef *kd, char *s)
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{
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char *rest = s;
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kd->start_column = 1;
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kd->start_char = 1;
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/* 0 means end of line */
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kd->end_column = 0;
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kd->end_char = 0;
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kd->start_column = strtoul(rest, &rest, 10);
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if(!kd->start_column)
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enprintf(2, "starting column cannot be 0\n");
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if(*rest == '.')
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kd->start_char = strtoul(rest+1, &rest, 10);
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if(*rest == ',') {
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kd->end_column = strtoul(rest+1, &rest, 10);
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if(kd->end_column < kd->start_column)
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enprintf(2, ",%u is too small\n", kd->end_column);
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}
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if(*rest == '.')
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kd->end_char = strtoul(rest+1, &rest, 10);
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if(*rest != '\0')
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return -1;
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return 0;
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}
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static char *
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next_nonblank(char *s)
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{
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for(; *s && isblank(*s); s++);
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return s;
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}
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static char *
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next_blank(char *s)
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{
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for(; *s && !isblank(*s); s++);
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return s;
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}
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static char *
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columns(char *line, const struct keydef *kd)
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{
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char *rest;
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char *start, *end;
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unsigned i;
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for(rest = line, i = 0; i < kd->start_column; i++) {
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if(i != 0)
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rest = next_blank(rest);
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rest = next_nonblank(rest);
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}
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for(i = 1; i < kd->start_char && !isblank(*rest); i++, rest++);
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start = rest;
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if(kd->end_column) {
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for(rest = line, i = 0; i < kd->end_column; i++) {
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if(i != 0)
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rest = next_blank(rest);
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rest = next_nonblank(rest);
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}
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if(kd->end_char) {
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for(i = 1; i < kd->end_char && *rest && !isblank(*rest); i++, rest++);
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} else {
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rest = next_blank(rest);
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}
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end = rest;
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} else {
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end = rest + strlen(rest);
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}
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return strndup(start, end - start);
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}
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