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lib/say.c

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+/*
+ *   gcklib.say - Provides printing and some string utilies
+ *
+ *
+ *   LICENSE: BSD-3-Clause
+ *
+ *   Copyright (c) 2025 GCK
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * 
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ * 
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ * 
+ * 3. Neither the name of the copyright holder nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "say.h"
+
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/ioctl.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <string.h>
+
+#include "xmem.h"
+
+void alert()
+{
+	fputs("\a", stderr);
+	fflush(stderr);
+	return;
+}
+
+int vasprintf(char **result, const char *fmt, va_list ap)
+{
+	int total_width = strlen(fmt) + 1;
+	*result = (char *)xmalloc(total_width);
+	return vsprintf(*result, fmt, ap);
+}
+
+int asprintf(char **buf, const char *fmt, ...)
+{
+	int status;
+	va_list ap;
+	va_start(ap, fmt);
+	status = vasprintf(buf, fmt, ap);
+	va_end(ap);
+	return status;
+}
+
+int say(const char *restrict format, ...)
+{
+	struct winsize w;
+	if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &w) == -1) {
+		va_list args;
+		va_start(args, format);
+		int ret = vprintf(format, args);
+		va_end(args);
+		putchar('\n');
+		fflush(stdout);
+		return ret;
+	}
+
+	printf("\0337"); // save cursor (ESC 7)
+	printf("\033[%d;1H", w.ws_row); // move to last row
+	printf("\033[2K"); // clear entire line
+
+	va_list args;
+	va_start(args, format);
+	int ret = vprintf(format, args); // print formatted message
+	va_end(args);
+
+	fflush(stdout); // ensure it's visible immediately
+	printf("\0338"); // restore cursor (ESC 8)
+	fflush(stdout);
+
+	return ret;
+}
+
+_Noreturn void die(const char *msg)
+{
+	fputs(msg, stderr);
+	exit(EXIT_FAILURE);
+}
+
+/* end of file say.c */