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Add nl(1).

This commit is contained in:
Jonas 'Sortie' Termansen 2021-03-13 20:19:10 +01:00
parent a8f8b4cfd6
commit b52bfa5978
3 changed files with 424 additions and 0 deletions

1
utils/.gitignore vendored
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@ -32,6 +32,7 @@ memstat
mkdir
mktemp
mv
nl
pager
passwd
ps

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@ -43,6 +43,7 @@ memstat \
mkdir \
mktemp \
mv \
nl \
pager \
passwd \
ps \

422
utils/nl.c Normal file
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@ -0,0 +1,422 @@
/*
* Copyright (c) 2021 Jonas 'Sortie' Termansen.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* nl.c
* Number lines.
*/
#include <err.h>
#include <errno.h>
#include <inttypes.h>
#include <regex.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
enum format
{
LN,
RN,
RZ,
};
struct style
{
char c;
regex_t regex;
};
static char delim[] = "\\:\\:\\:";
static off_t initial = 1;
static off_t increment = 1;
static bool restart = false;
static off_t blank_join = 1;
static enum format format = RN;
static int width = 6;
static const char* separator = "\t";
static struct style styles[] =
{
{.c = 'n'},
{.c = 't'},
{.c = 'n'},
};
static off_t line_number;
static size_t state = 1;
static off_t blanks = 0;
static bool nl(FILE* fp, const char* path)
{
char* line = NULL;
size_t line_size = 0;
ssize_t line_length;
while ( 0 < (line_length = getline(&line, &line_size, fp)) )
{
if ( line[line_length - 1] == '\n' )
line[--line_length] = '\0';
bool error = false;
if ( delim[0] && !strcmp(line, delim) )
{
state = 0;
if ( restart )
line_number = initial;
error = printf("\n") == EOF;
}
else if ( delim[0] && !strcmp(line, delim + 2) )
{
state = 1;
error = printf("\n") == EOF;
}
else if ( delim[0] && !strcmp(line, delim + 4) )
{
state = 2;
error = printf("\n") == EOF;
}
else
{
const struct style* style = &styles[state];
bool counts =
style->c == 'a' ||
(style->c == 't' && strcmp(line, "") != 0) ||
(style->c == 'p' && !regexec(&style->regex, line, 0, NULL, 0));
if ( counts )
{
if ( !strcmp(line, "") )
{
blanks++;
if ( blank_join <= blanks )
blanks = 0;
else
counts = false;
}
else
blanks = 0;
}
if ( counts )
{
switch ( format )
{
case LN:
error = printf("%-*ji%s%s\n", width, (intmax_t) line_number,
separator, line) == EOF;
break;
case RN:
error = printf("%*ji%s%s\n", width, (intmax_t) line_number,
separator, line) == EOF;
break;
case RZ:
error = printf("%0*ji%s%s\n", width, (intmax_t) line_number,
separator, line) == EOF;
break;
}
line_number += increment;
}
else
error = printf("%*s %s\n", width, "", line) == EOF;
}
if ( error )
{
warn("stdout");
free(line);
return false;
}
}
free(line);
if ( ferror(fp) )
{
warn("%s", path);
return false;
}
return true;
}
static bool nl_path(const char* path)
{
if ( !strcmp(path, "-") )
return nl(stdin, path);
FILE* fp = fopen(path, "r");
if ( !fp )
{
warn("%s", path);
return false;
}
bool ret = nl(fp, path);
fclose(fp);
return ret;
}
static void compact_arguments(int* argc, char*** argv)
{
for ( int i = 0; i < *argc; i++ )
{
while ( i < *argc && !(*argv)[i] )
{
for ( int n = i; n < *argc; n++ )
(*argv)[n] = (*argv)[n+1];
(*argc)--;
}
}
}
static void set_style(struct style* style, const char* string, const char* opt)
{
if ( style->c == 'p' )
regfree(&style->regex);
if ( !strcmp(string, "a") || !strcmp(string, "t") || !strcmp(string, "n") )
style->c = string[0];
else if ( string[0] == 'p' || string[0] == 'E' )
{
int error = regcomp(&style->regex, string + 1,
string[0] == 'E' ? REG_EXTENDED : 0);
if ( error )
{
size_t size = regerror(error, NULL, NULL, 0);
char* error_string = malloc(size);
if ( !error_string )
errx(1, "%s: Invalid regular expression: %s", opt, string);
regerror(error, NULL, error_string, size);
errx(1, "%s: %s: %s", opt, error_string, string);
}
style->c = 'p';
}
else
errx(1, "%s: Invalid style: %s", opt, string);
}
int main(int argc, char* argv[])
{
const char* parameter;
for ( int i = 1; i < argc; i++ )
{
const char* arg = argv[i];
if ( arg[0] != '-' || !arg[1] )
continue;
argv[i] = NULL;
if ( !strcmp(arg, "--") )
break;
if ( arg[1] != '-' )
{
char c;
while ( (c = *++arg) ) switch ( c )
{
case 'b':
if ( !*(parameter = arg + 1) )
{
if ( i + 1 == argc )
errx(2, "option requires an argument -- 'b'");
parameter = argv[i+1];
argv[++i] = NULL;
}
set_style(&styles[1], parameter, "-b");
arg = "b";
break;
case 'd':
if ( !*(parameter = arg + 1) )
{
if ( i + 1 == argc )
errx(2, "option requires an argument -- 'd'");
parameter = argv[i+1];
argv[++i] = NULL;
}
if ( !parameter[0] )
memset(delim, 0, sizeof(delim));
else if ( !parameter[1] )
{
delim[0] = parameter[0];
delim[1] = ':';
delim[2] = parameter[0];
delim[3] = ':';
delim[4] = parameter[0];
delim[5] = ':';
}
else if ( !parameter[2] )
{
delim[0] = parameter[0];
delim[1] = parameter[1];
delim[2] = parameter[0];
delim[3] = parameter[1];
delim[4] = parameter[0];
delim[5] = parameter[1];
}
else
errx(1, "-d: Delimiter must be one or two characters");
arg = "d";
break;
case 'f':
if ( !*(parameter = arg + 1) )
{
if ( i + 1 == argc )
errx(2, "option requires an argument -- 'f'");
parameter = argv[i+1];
argv[++i] = NULL;
}
set_style(&styles[2], parameter, "-f");
arg = "f";
break;
case 'h':
if ( !*(parameter = arg + 1) )
{
if ( i + 1 == argc )
errx(2, "option requires an argument -- 'h'");
parameter = argv[i+1];
argv[++i] = NULL;
}
set_style(&styles[0], parameter, "-h");
arg = "h";
break;
case 'i':
{
if ( !*(parameter = arg + 1) )
{
if ( i + 1 == argc )
errx(2, "option requires an argument -- 'i'");
parameter = argv[i+1];
argv[++i] = NULL;
}
char* end;
errno = 0;
intmax_t value = strtoimax(parameter, &end, 10);
if ( value < 0 || (off_t) value != value || *end )
errno = ERANGE;
if ( errno )
err(1, "-i: %s", parameter);
increment = (off_t) value;
arg = "i";
break;
}
case 'l':
{
if ( !*(parameter = arg + 1) )
{
if ( i + 1 == argc )
errx(2, "option requires an argument -- 'l'");
parameter = argv[i+1];
argv[++i] = NULL;
}
char* end;
errno = 0;
intmax_t value = strtoimax(parameter, &end, 10);
if ( value < 0 || (off_t) value != value || *end )
errno = ERANGE;
if ( errno )
err(1, "-l: %s", parameter);
blank_join = (off_t) value;
arg = "l";
break;
}
case 'n':
if ( !*(parameter = arg + 1) )
{
if ( i + 1 == argc )
errx(2, "option requires an argument -- 'n'");
parameter = argv[i+1];
argv[++i] = NULL;
}
if ( !strcmp(parameter, "ln") )
format = LN;
else if ( !strcmp(parameter, "rn") )
format = RN;
else if ( !strcmp(parameter, "rz") )
format = RZ;
else
errx(1, "-n: Invalid format: %s", parameter);
arg = "n";
break;
case 'p': restart = false; break;
case 's':
if ( !*(separator = arg + 1) )
{
if ( i + 1 == argc )
errx(2, "option requires an argument -- 's'");
separator = argv[i+1];
argv[++i] = NULL;
}
arg = "s";
break;
case 'v':
{
if ( !*(parameter = arg + 1) )
{
if ( i + 1 == argc )
errx(2, "option requires an argument -- 'v'");
parameter = argv[i+1];
argv[++i] = NULL;
}
char* end;
errno = 0;
intmax_t value = strtoimax(parameter, &end, 10);
if ( value < 0 || (off_t) value != value || *end )
errno = ERANGE;
if ( errno )
err(1, "-v: %s", parameter);
initial = (off_t) value;
arg = "v";
break;
}
case 'w':
{
if ( !*(parameter = arg + 1) )
{
if ( i + 1 == argc )
errx(2, "option requires an argument -- 'w'");
parameter = argv[i+1];
argv[++i] = NULL;
}
char* end;
errno = 0;
long value = strtol(parameter, &end, 10);
if ( value < 0 || (int) value != value || *end )
errno = ERANGE;
if ( errno )
err(1, "-w: %s", parameter);
width = (int) value;
arg = "w";
break;
}
default:
errx(2, "unknown option -- '%c'", c);
}
}
else
errx(2, "unknown option: %s", arg);
}
compact_arguments(&argc, &argv);
line_number = initial;
int ret = 0;
if ( argc == 1 )
{
if ( !nl(stdin, "-") )
ret = 1;
}
else
{
for ( int i = 1; i < argc; i++ )
{
if ( !nl_path(argv[i]) )
ret = 1;
}
}
if ( ferror(stdout) || fflush(stdout) == EOF )
return 1;
return ret;
}