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add -t flag to sort

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This commit is contained in:
Jakob Kramer 2014-05-15 20:08:17 +02:00 committed by sin
parent 2ab2d2ee3b
commit 7d1fd2621e
2 changed files with 54 additions and 54 deletions
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28
sort.1
View File

@ -4,9 +4,10 @@ sort \- sort lines
.SH SYNOPSIS
.B sort
.RB [ \-bnru ]
.RB [ \-t
.IR delim ]
.RB [ \-k
.I key
.R ]...
.IR key ]...
.RI [ file ...]
.SH DESCRIPTION
.B sort
@ -17,16 +18,7 @@ given, sort reads from stdin.
.B \-b
skip leading whitespace of columns when sorting.
.TP
.B \-n
perform a numeric sort.
.TP
.B \-r
reverses the sort.
.TP
.B \-u
prints equal lines only once.
.TP
.B \-k key
.BI \-k \ key
specifies a key definition of the form
.BR S [. s ][ f ][, E [. e ][ f ]]
where
@ -50,3 +42,15 @@ can be used to specify options
that only apply to this key definition.
.B b
is special in that it only applies to the column that it was specified after.
.TP
.B \-n
perform a numeric sort.
.TP
.B \-r
reverses the sort.
.TP
.BI \-t \ delim
specifies the field delimiter.
.TP
.B \-u
prints equal lines only once.

76
sort.c
View File

@ -34,20 +34,19 @@ static struct kdlist *tail = NULL;
static void addkeydef(char *, int);
static void freelist(void);
static int linecmp(const char **, const char **);
static char *next_nonblank(char *);
static char *next_blank(char *);
static char *skipblank(char *);
static int parse_flags(char **, int *, int);
static int parse_keydef(struct keydef *, char *, int);
static char *skip_columns(char *, size_t, bool);
static char *end_column(char *);
static char *nextcol(char *);
static char *columns(char *, const struct keydef *);
static bool uflag = false;
static char *fieldsep = NULL;
static void
usage(void)
{
enprintf(2, "usage: %s [-bnru] [-k def]... [file...]\n", argv0);
enprintf(2, "usage: %s [-bnru] [-t delim] [-k def]... [file...]\n", argv0);
}
int
@ -59,21 +58,26 @@ main(int argc, char *argv[])
int global_flags = 0;
ARGBEGIN {
case 'b':
global_flags |= MOD_STARTB | MOD_ENDB;
break;
case 'k':
addkeydef(EARGF(usage()), global_flags);
break;
case 'n':
global_flags |= MOD_N;
break;
case 'r':
global_flags |= MOD_R;
break;
case 't':
fieldsep = EARGF(usage());
if(strlen(fieldsep) != 1)
usage();
break;
case 'u':
uflag = true;
break;
case 'b':
global_flags |= MOD_STARTB | MOD_ENDB;
break;
case 'k':
addkeydef(EARGF(usage()), global_flags);
break;
default:
usage();
} ARGEND;
@ -224,7 +228,7 @@ parse_keydef(struct keydef *kd, char *s, int flags)
}
static char *
next_nonblank(char *s)
skipblank(char *s)
{
while(*s && isblank(*s))
s++;
@ -232,51 +236,43 @@ next_nonblank(char *s)
}
static char *
next_blank(char *s)
nextcol(char *s)
{
if(fieldsep == NULL) {
s = skipblank(s);
while(*s && !isblank(*s))
s++;
return s;
}
static char *
skip_columns(char *s, size_t n, bool bflag)
{
size_t i;
for(i = 0; i < n; i++) {
if(i > 0)
s = end_column(s);
if(bflag)
s = next_nonblank(s);
} else {
if(strchr(s, *fieldsep) == NULL)
s = strchr(s, '\0');
else
s = strchr(s, *fieldsep) + 1;
}
return s;
}
static char *
end_column(char *s)
{
if(isblank(*s))
s = next_nonblank(s);
return next_blank(s);
}
static char *
columns(char *line, const struct keydef *kd)
{
char *start, *end;
char *res;
int i;
start = skip_columns(line, kd->start_column, kd->flags & MOD_STARTB);
start += MIN(kd->start_char, end_column(start) - start) - 1;
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) {
end = skip_columns(line, kd->end_column, kd->flags & MOD_ENDB);
for(i = 1, end = line; i < kd->end_column; i++)
end = nextcol(end);
if(kd->flags & MOD_ENDB)
end = skipblank(end);
if(kd->end_char)
end += MIN(kd->end_char, end_column(end) - end);
end += MIN(kd->end_char, nextcol(end) - end);
else
end = end_column(end);
end = nextcol(end);
} else {
if((end = strchr(line, '\n')) == NULL)
end = strchr(line, '\0');