Add support for fremove(), formatted remove() replacement

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

README.md

@@ -189,6 +189,13 @@ Generic Functions
   
   > **Notice:** the swapped order of `pathname` and `mode`!
 
+- `fremove(fmt, ...)`
+
+  Like `remove()`, but takes a formatted string as argument.  This
+  greatly simplifies operations that usually consist of composing a
+  filename from parts into a dynamic buffer before actually removing
+  the file.
+
 - `fsendfile(src, dst, len)`
 
   Copy data between file streams, very similar to `fcopyfile()`, but

src/Makefile.am

@@ -5,7 +5,7 @@ libite_la_CFLAGS      = -W -Wall -Wextra
 libite_la_LDFLAGS     = $(AM_LDFLAGS) -version-info 6:0:1
 libite_la_SOURCES     = chomp.c		copyfile.c			\
 			conio.c		conio.h				\
-			dir.c		fopenf.c			\
+			dir.c		fopenf.c	fremove.c	\
 			fexist.c	fisdir.c			\
 			fparseln.c	fsendfile.c			\
 			ifconfig.c	lfile.c				\

src/fremove.c

@@ -0,0 +1,61 @@
+/* Formatted fremove()
+ *
+ * Copyright (c) 2020  Joachim Nilsson <troglobit@gmail.com>
+ *
+ * Permission to use, copy, modify, and/or 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.
+ */
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdarg.h>
+#include <stdlib.h>
+
+/**
+ * fremove - Remove a file based on the formatted string and optional arguments
+ * @fmt: Formatted string to be composed into a pathname
+ *
+ * This function is an extension to remove(), lessening the burden of
+ * first having to compose the filename from parts in a seprate buffer.
+ *
+ * Returns:
+ * Return value for remove(3).
+ */
+int fremove(const char *fmt, ...)
+{
+	va_list ap;
+	char *file;
+	int len;
+
+	va_start(ap, fmt);
+	len = vsnprintf(NULL, 0, fmt, ap);
+	va_end(ap);
+
+	file = alloca(len + 1);
+	if (!file) {
+		errno = ENOBUFS;
+		return -1;
+	}
+
+	va_start(ap, fmt);
+	vsnprintf(file, len + 1, fmt, ap);
+	va_end(ap);
+
+	return remove(file);
+}
+
+/**
+ * Local Variables:
+ *  indent-tabs-mode: t
+ *  c-file-style: "linux"
+ * End:
+ */

src/lite.h

@@ -66,6 +66,7 @@ int     fexist     (const char *file);
 int     fisdir     (const char *path);
 
 FILE   *fopenf     (const char *mode, const char *fmt, ...);
+int     fremove    (const char *fmt, ...);
 FILE   *tempfile   (void);
 ssize_t copyfile   (const char *src, const char *dst, int len, int opt);
 int     movefile   (const char *src, const char *dst);