add nl

Makefile

@@ -5,7 +5,7 @@ LIB = util/afgets.o util/agetcwd.o util/concat.o util/enmasse.o util/eprintf.o \
       util/recurse.o
 
 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 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 tail.c tee.c \
       touch.c true.c wc.c
 OBJ = $(SRC:.c=.o) $(LIB)
 BIN = $(SRC:.c=)
@@ -13,13 +13,13 @@ MAN = $(SRC:.c=.1)
 
 all: $(BIN)
 
-$(OBJ): util.h
+$(OBJ): util.h config.mk
 $(BIN): util.a
 cat.o grep.o tail.o: text.h
 
 .o:
-	@echo CC -o $@
-	@$(CC) -o $@ $< util.a $(LDFLAGS)
+	@echo LD -o $@
+	@$(LD) -o $@ $< util.a $(LDFLAGS)
 
 .c.o:
 	@echo CC -c $<

config.mk

@@ -1,9 +1,15 @@
 # sbase version
 VERSION = 0.0
 
-#CC = cc
+#CC = gcc
 #CC = musl-gcc
-
+LD = $(CC)
 CPPFLAGS = -D_POSIX_C_SOURCE=200112L
 CFLAGS   = -Os -ansi -Wall -pedantic $(CPPFLAGS)
 LDFLAGS  = -s -static
+
+#CC = tcc
+#LD = $(CC)
+#CPPFLAGS = -D_POSIX_C_SOURCE=200112L
+#CFLAGS   = -Os -Wall $(CPPFLAGS)
+#LDFLAGS  =

nl.1

@@ -0,0 +1,44 @@
+.TH NL 1 sbase\-VERSION
+.SH NAME
+nl \- number lines
+.SH SYNOPSIS
+.B nl
+.RB [ \-b
+.IR mode ]
+.RB [ \-i
+.IR increment ]
+.RB [ \-s
+.IR separator ]
+.RI [ file ...]
+.SH DESCRIPTION
+.B nl
+reads each file in sequence and writes it to stdout with non-empty lines
+numbered.  If no file is given, nl reads from stdin.
+.SH OPTIONS
+.TP
+.BI \-b " mode"
+defines which lines will be numbered:
+.RS
+.TP
+.B a
+all lines.
+.TP
+.B n
+no lines.
+.TP
+.BI p pattern
+only lines which match
+.IR pattern ,
+a regular expression as defined in
+.IR regex (7).
+.TP
+.B t
+only non-empty lines (default).
+.RE
+.TP
+.BI \-i " increment"
+defines the increment between numbered lines.
+.TP
+.BI \-s " separator"
+defines the string used to separate line numbers and lines.  By default this is
+a tab.

nl.c

@@ -0,0 +1,69 @@
+/* See LICENSE file for copyright and license details. */
+#include <regex.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include "text.h"
+#include "util.h"
+
+static void nl(FILE *, const char *);
+
+static char mode = 't';
+static const char *sep = "\t";
+static long incr = 1;
+static regex_t preg;
+
+int
+main(int argc, char *argv[])
+{
+	char c, *end;
+	FILE *fp;
+
+	while((c = getopt(argc, argv, "b:i:s:")) != -1)
+		switch(c) {
+		case 'b':
+			mode = optarg[0];
+			if(optarg[0] == 'p')
+				regcomp(&preg, &optarg[1], REG_NOSUB);
+			else if(!strchr("ant", optarg[0]) || optarg[1] != '\0')
+				eprintf("usage: %s [-b mode] [file...]\n", argv[0]);
+			break;
+		case 'i':
+			incr = strtol(optarg, &end, 0);
+			if(*end != '\0')
+				eprintf("%s: not a number\n", optarg);
+			break;
+		case 's':
+			sep = optarg;
+			break;
+		default:
+			exit(EXIT_FAILURE);
+		}
+	if(optind == argc)
+		nl(stdin, "<stdin>");
+	else for(; optind < argc; optind++) {
+		if(!(fp = fopen(argv[optind], "r")))
+			eprintf("fopen %s:", argv[optind]);
+		nl(fp, argv[optind]);
+		fclose(fp);
+	}
+	return EXIT_SUCCESS;
+}
+
+void
+nl(FILE *fp, const char *str)
+{
+	char *buf = NULL;
+	long n = 0;
+	size_t size = 0;
+
+	while(afgets(&buf, &size, fp))
+		if((mode == 'a')
+		|| (mode == 'p' && !regexec(&preg, buf, 0, NULL, 0))
+		|| (mode == 't' && buf[0] != '\n'))
+			printf("%6ld%s%s", n += incr, sep, buf);
+		else
+			printf("       %s", buf);
+	free(buf);
+}