From cb0d932597377a6dbc595dbe13f55c9a2cf1ad00 Mon Sep 17 00:00:00 2001
From: Mattias Andrée <maandree@kth.se>
Date: Tue, 4 Jan 2022 21:15:13 +0100
Subject: Replace dependency on libsimple with boilerplate code
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Signed-off-by: Mattias Andrée <maandree@kth.se>
---
 Makefile  |  4 +++-
 arg.h     | 38 ++++++++++++++++++++++++++++++++++++++
 common.h  | 25 +++++++++++++++++++++++--
 config.mk |  2 +-
 makel.c   | 10 +++++++---
 util.c    | 61 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 6 files changed, 133 insertions(+), 7 deletions(-)
 create mode 100644 arg.h
 create mode 100644 util.c

diff --git a/Makefile b/Makefile
index 13b29b2..864b5a5 100644
--- a/Makefile
+++ b/Makefile
@@ -7,9 +7,11 @@ OBJ =\
 	makel.o\
 	makefile.o\
 	text.o\
-	ui.o
+	ui.o\
+	util.o
 
 HDR =\
+	arg.h\
 	common.h
 
 all: makel
diff --git a/arg.h b/arg.h
new file mode 100644
index 0000000..1231320
--- /dev/null
+++ b/arg.h
@@ -0,0 +1,38 @@
+/* Trivial code, not subject to copyright, use as you see fit.
+ * Reimplementation of 20h's arg.h */
+
+#ifndef ARG_H
+#define ARG_H
+
+#include <stddef.h>
+
+
+extern const char *argv0;
+
+
+#define ARGBEGIN        do {\
+                                char arg_h_flag_, arg_h_break_;\
+				if (!argc)\
+					break;\
+                                argv0 = argv[0];\
+                                while (--argc, *++argv && argv[0][0] == '-' && argv[0][1]) {\
+					if (argv[0][1] == '-' && !argv[0][2]) {\
+                                                argv++;\
+                                                argc--;\
+                                                break;\
+                                        }\
+                                        for (arg_h_break_ = 0; !arg_h_break_ && *++*argv;) {\
+                                                switch ((arg_h_flag_ = **argv))
+
+#define ARGEND				}\
+				}\
+			} while (0)
+
+
+#define FLAG()		(arg_h_flag_)
+
+#define ARG()		(arg_h_break_ = 1, argv[0][1] ? &argv[0][1] :\
+			                   argv[1]    ? (argc--, *++argv) :\
+			                                (usage(), NULL))
+
+#endif
diff --git a/common.h b/common.h
index 35988cc..8d2a5f4 100644
--- a/common.h
+++ b/common.h
@@ -1,10 +1,19 @@
 /* See LICENSE file for copyright and license details. */
+#include <ctype.h>
+#include <errno.h>
+#include <fcntl.h>
 #include <locale.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <wchar.h>
 
-#include <libsimple.h>
-#include <libsimple-arg.h>
 #include <grapheme.h>
 
+#include "arg.h"
+
 
 #if defined(__GNUC__)
 # pragma GCC diagnostic ignored "-Wsuggest-attribute=format"
@@ -24,6 +33,10 @@
 #define EXIT_ERROR         8
 
 
+#define ELEMSOF(ARRAY) (sizeof(ARRAY) / sizeof(*(ARRAY)))
+#define MAX(A, B) ((A) > (B) ? (A) : (B))
+
+
 #define LIST_WARNING_CLASSES(X)\
 	X(WC_MAKEFILE, "makefile", INFORM)\
 	X(WC_EXTRA_MAKEFILE, "extra-makefile", WARN)\
@@ -121,3 +134,11 @@ void xprintwarningf(enum warning_class class, int severity, const char *fmt, ...
 #define warnf_undefined(CLASS, ...) xprintwarningf(CLASS, EXIT_UNDEFINED, __VA_ARGS__)
 void printerrorf(const char *fmt, ...);
 void printtipf(enum warning_class class, const char *fmt, ...);
+
+
+/* util.c */
+void *erealloc(void *, size_t);
+void *ecalloc(size_t, size_t);
+void *emalloc(size_t);
+void *ememdup(const void *, size_t);
+void eprintf(const char *, ...);
diff --git a/config.mk b/config.mk
index bf92326..7c7782d 100644
--- a/config.mk
+++ b/config.mk
@@ -5,4 +5,4 @@ CC = cc
 
 CPPFLAGS = -D_DEFAULT_SOURCE -D_BSD_SOURCE -D_XOPEN_SOURCE=700 -D_GNU_SOURCE
 CFLAGS   = -std=c99 -Wall -g
-LDFLAGS  = -lsimple -lgrapheme
+LDFLAGS  = -lgrapheme
diff --git a/makel.c b/makel.c
index 514be21..eeda146 100644
--- a/makel.c
+++ b/makel.c
@@ -1,7 +1,13 @@
 /* See LICENSE file for copyright and license details. */
 #include "common.h"
 
-NUSAGE(EXIT_ERROR, "[-f makefile]");
+const char *argv0 = "makel";
+
+static void
+usage(void) {
+	fprintf(stderr, "%s [-f makefile]\n", argv0);
+	exit(EXIT_ERROR);
+}
 
 
 int exit_status = 0;
@@ -149,8 +155,6 @@ main(int argc, char *argv[])
 	size_t nlines;
 	size_t i;
 
-	libsimple_default_failure_exit = EXIT_ERROR;
-
 	/* make(1) shall support mixing of options and operands (up to --) */
 	ARGBEGIN {
 	case 'f':
diff --git a/util.c b/util.c
new file mode 100644
index 0000000..07ebfc0
--- /dev/null
+++ b/util.c
@@ -0,0 +1,61 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+
+
+void *
+erealloc(void *ptr, size_t n)
+{
+	void *ret = realloc(ptr, n);
+	if (!ret)
+		eprintf("realloc %zu:", n);
+	return ret;
+}
+
+
+void *
+ecalloc(size_t n, size_t m)
+{
+	void *ret = calloc(n, m);
+	if (!ret)
+		eprintf("calloc %zu %zu:", n, m);
+	return ret;
+}
+
+
+void *
+emalloc(size_t n)
+{
+	void *ret = malloc(n);
+	if (!ret)
+		eprintf("malloc %zu:", n);
+	return ret;
+}
+
+
+void *
+ememdup(const void *ptr, size_t n)
+{
+	void *ret = emalloc(n);
+	memcpy(ret, ptr, n);
+	return ret;
+}
+
+
+void
+eprintf(const char *fmt, ...)
+{
+	va_list ap;
+	int err = errno;
+	char end = *fmt ? strchr(fmt, '\0')[-1] : '\0';
+	va_start(ap, fmt);
+	fprintf(stderr, "%s: ", argv0);
+	vfprintf(stderr, fmt, ap);
+	if (end == '\0')
+		fprintf(stderr, "%s\n", strerror(err));
+	else if (end == ':')
+		fprintf(stderr, " %s\n", strerror(err));
+	else if (end != '\n')
+		fprintf(stderr, "\n");
+	va_end(ap);
+	exit(EXIT_ERROR);
+}
-- 
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