sbase/sort.c

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5.3 KiB
C
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/* See LICENSE file for copyright and license details. */
#include <ctype.h>
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#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "text.h"
#include "util.h"
struct keydef {
int start_column;
int end_column;
int start_char;
int end_char;
int flags;
};
enum {
MOD_N = 1 << 1,
MOD_STARTB = 1 << 2,
MOD_ENDB = 1 << 3,
MOD_R = 1 << 4
};
struct kdlist {
struct keydef keydef;
struct kdlist *next;
};
static struct kdlist *head = NULL;
static struct kdlist *tail = NULL;
static void addkeydef(char *, int);
static void freelist(void);
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static int linecmp(const char **, const char **);
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static char *skipblank(char *);
static int parse_flags(char **, int *, int);
static int parse_keydef(struct keydef *, char *, int);
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static char *nextcol(char *);
static char *columns(char *, const struct keydef *);
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static bool uflag = false;
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static char *fieldsep = NULL;
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static void
usage(void)
{
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enprintf(2, "usage: %s [-bnru] [-t delim] [-k def]... [file...]\n", argv0);
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}
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int
main(int argc, char *argv[])
{
long i;
FILE *fp;
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struct linebuf linebuf = EMPTY_LINEBUF;
int global_flags = 0;
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ARGBEGIN {
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case 'b':
global_flags |= MOD_STARTB | MOD_ENDB;
break;
case 'k':
addkeydef(EARGF(usage()), global_flags);
break;
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case 'n':
global_flags |= MOD_N;
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break;
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case 'r':
global_flags |= MOD_R;
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break;
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case 't':
fieldsep = EARGF(usage());
if(strlen(fieldsep) != 1)
usage();
break;
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case 'u':
uflag = true;
break;
default:
usage();
} ARGEND;
if(!head && global_flags)
addkeydef("1", global_flags);
addkeydef("1", global_flags & MOD_R);
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if(argc == 0) {
getlines(stdin, &linebuf);
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} else for(; argc > 0; argc--, argv++) {
if(!(fp = fopen(argv[0], "r"))) {
enprintf(2, "fopen %s:", argv[0]);
continue;
}
getlines(fp, &linebuf);
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fclose(fp);
}
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qsort(linebuf.lines, linebuf.nlines, sizeof *linebuf.lines,
(int (*)(const void *, const void *))linecmp);
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for(i = 0; i < linebuf.nlines; i++) {
if(!uflag || i == 0 || linecmp((const char **)&linebuf.lines[i],
(const char **)&linebuf.lines[i-1])) {
fputs(linebuf.lines[i], stdout);
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}
}
freelist();
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return 0;
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}
static void
addkeydef(char *def, int flags)
{
struct kdlist *node;
node = malloc(sizeof(*node));
if(!node)
enprintf(2, "malloc:");
if(!head)
head = node;
if(parse_keydef(&node->keydef, def, flags))
enprintf(2, "faulty key definition\n");
if(tail)
tail->next = node;
node->next = NULL;
tail = node;
}
static void
freelist(void)
{
struct kdlist *node;
struct kdlist *tmp;
for(node = head; node; node = tmp) {
tmp = node->next;
free(node);
}
}
static int
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linecmp(const char **a, const char **b)
{
char *s1, *s2;
int res = 0;
struct kdlist *node;
for(node = head; node && res == 0; node = node->next) {
s1 = columns((char *)*a, &node->keydef);
s2 = columns((char *)*b, &node->keydef);
/* if -u is given, don't use default key definition
* unless it is the only one */
if(uflag && node == tail && head != tail)
res = 0;
else if(node->keydef.flags & MOD_N)
res = strtol(s1, 0, 10) - strtol(s2, 0, 10);
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else
res = strcmp(s1, s2);
if(node->keydef.flags & MOD_R)
res = -res;
free(s1);
free(s2);
}
return res;
}
static int
parse_flags(char **s, int *flags, int bflag)
{
while(isalpha((int)**s))
switch(*((*s)++)) {
case 'b':
*flags |= bflag;
break;
case 'n':
*flags |= MOD_N;
break;
case 'r':
*flags |= MOD_R;
break;
default:
return -1;
}
return 0;
}
static int
parse_keydef(struct keydef *kd, char *s, int flags)
{
char *rest = s;
kd->start_column = 1;
kd->start_char = 1;
/* 0 means end of line */
kd->end_column = 0;
kd->end_char = 0;
kd->flags = flags;
kd->start_column = strtol(rest, &rest, 10);
if(kd->start_column < 1)
return -1;
if(*rest == '.')
kd->start_char = strtol(rest+1, &rest, 10);
if(kd->start_char < 1)
return -1;
if(parse_flags(&rest, &kd->flags, MOD_STARTB) == -1)
return -1;
if(*rest == ',') {
kd->end_column = strtol(rest+1, &rest, 10);
if(kd->end_column && kd->end_column < kd->start_column)
return -1;
if(*rest == '.') {
kd->end_char = strtol(rest+1, &rest, 10);
if(kd->end_char < 1)
return -1;
}
if(parse_flags(&rest, &kd->flags, MOD_ENDB) == -1)
return -1;
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}
if(*rest != '\0')
return -1;
return 0;
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}
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static char *
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skipblank(char *s)
{
while(*s && isblank(*s))
s++;
return s;
}
static char *
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nextcol(char *s)
{
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if(fieldsep == NULL) {
s = skipblank(s);
while(*s && !isblank(*s))
s++;
} else {
if(strchr(s, *fieldsep) == NULL)
s = strchr(s, '\0');
else
s = strchr(s, *fieldsep) + 1;
}
return s;
}
static char *
columns(char *line, const struct keydef *kd)
{
char *start, *end;
char *res;
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int i;
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for(i = 1, start = line; i < kd->start_column; i++)
start = nextcol(start);
if(kd->flags & MOD_STARTB)
start = skipblank(start);
start += MIN(kd->start_char, nextcol(start) - start) - 1;
if(kd->end_column) {
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for(i = 1, end = line; i < kd->end_column; i++)
end = nextcol(end);
if(kd->flags & MOD_ENDB)
end = skipblank(end);
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if(kd->end_char)
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end += MIN(kd->end_char, nextcol(end) - end);
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else
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end = nextcol(end);
} else {
if((end = strchr(line, '\n')) == NULL)
end = strchr(line, '\0');
}
if((res = strndup(start, end - start)) == NULL)
enprintf(2, "strndup:");
return res;
}