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lib/err.c

@@ -0,0 +1,151 @@
+/* Copyright (C) GCK
+ *
+ * This file is part of gcklib
+ *
+ * This project and file is licensed under the BSD-3-Clause license.
+ * <https://opensource.org/licenses/BSD-3-Clause>
+ */
+
+#include <stdio.h>
+#include <stdarg.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "err.h"
+
+#define RESET "\e[0m"
+#define ERROR "\e[1;91m"
+#define WARN "\e[1;95m"
+#define NOTE "\e[1;94m"
+#define HINT "\e[38;5;166m"
+
+static bool __check(void)
+{
+	static int done = 0;
+	static bool cached = false;
+
+	if (!done) {
+		const char *term = getenv("TERM");
+		cached = isatty(STDOUT_FILENO) && term != NULL &&
+			 (strstr(term, "color") != NULL ||
+			  strstr(term, "ansi") != NULL ||
+			  strstr(term, "xterm") != NULL);
+		done = 1;
+	}
+
+	return cached;
+}
+
+void errorf(const char *format, ...)
+{
+	va_list args;
+	va_start(args, format);
+
+	if (__check()) {
+		fprintf(stderr, "%serror%s: ", ERROR, RESET);
+	} else {
+		fputs("error: ", stderr);
+	}
+
+	vfprintf(stderr, format, args);
+	fputc('\n', stderr);
+
+	va_end(args);
+}
+void fatalf(const char *format, ...)
+{
+	va_list args;
+	va_start(args, format);
+
+	if (__check()) {
+		fprintf(stderr, "%sfatal%s: ", ERROR, RESET);
+	} else {
+		fputs("fatal: ", stderr);
+	}
+
+	vfprintf(stderr, format, args);
+	fputc('\n', stderr);
+
+	va_end(args);
+
+	exit(EXIT_FAILURE);
+}
+void warnf(const char *format, ...)
+{
+	va_list args;
+	va_start(args, format);
+
+	if (__check()) {
+		fprintf(stderr, "%swarning%s: ", WARN, RESET);
+	} else {
+		fputs("warning: ", stderr);
+	}
+
+	vfprintf(stderr, format, args);
+	fputc('\n', stderr);
+
+	va_end(args);
+}
+void notef(const char *format, ...)
+{
+	va_list args;
+	va_start(args, format);
+
+	if (__check()) {
+		fprintf(stderr, "%snote%s: ", NOTE, RESET);
+	} else {
+		fputs("note: ", stderr);
+	}
+
+	vfprintf(stderr, format, args);
+	fputc('\n', stderr);
+
+	va_end(args);
+}
+void hintf(const char *format, ...)
+{
+	va_list args;
+	va_start(args, format);
+
+	if (__check()) {
+		fprintf(stderr, "%shint: ", HINT);
+	} else {
+		fputs("hint: ", stderr);
+	}
+
+	vfprintf(stderr, format, args);
+
+	if (__check()) {
+		fprintf(stderr, "%s\n", RESET);
+	} else {
+		fputc('\n', stderr);
+	}
+
+	va_end(args);
+}
+
+void errorfa(int code)
+{
+	errorf(strerror(code));
+}
+
+void fatalfa(int code)
+{
+	fatalf(strerror(code));
+}
+
+void notefa(int code)
+{
+	notef(strerror(code));
+}
+
+void warnfa(int code)
+{
+	warnf(strerror(code));
+}
+
+void hintfa(int code)
+{
+	hintf(strerror(code));
+}