Add build system scaffolding and libc headers

1 files changed, 131 insertions, 0 deletions

diff --git a/lib/libc/monetary/strfmon.c b/lib/libc/monetary/strfmon.c
new file mode 100644
index 00000000..8ba0d48d
--- /dev/null
+++ b/lib/libc/monetary/strfmon.c
@@ -0,0 +1,131 @@
+// Orginal source:
+// https://git.musl-libc.org/cgit/musl/tree/src/monetary/strfmon.c
+//
+// ----------------------------------------------------------------------
+// Copyright © 2005-2020 Rich Felker, et al.
+//
+// Permission is hereby granted, free of charge, to any person obtaining
+// a copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to
+// permit persons to whom the Software is furnished to do so, subject to
+// the following conditions:
+//
+// The above copyright notice and this permission notice shall be
+// included in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+// SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+// ----------------------------------------------------------------------
+
+#include <libc.h>
+#include <ctype.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdarg.h>
+#include <monetary.h>
+
+static ssize_t vstrfmon_l(char *s, size_t n, const char *fmt, va_list ap)
+{
+	size_t l;
+	double x;
+	int fill, nogrp, negpar, nosym, left, intl;
+	int lp, rp, w, fw;
+	char *s0 = s;
+	for (; n && *fmt;) {
+		if (*fmt != '%') {
+literal:
+			*s++ = *fmt++;
+			n--;
+			continue;
+		}
+		fmt++;
+		if (*fmt == '%')
+			goto literal;
+
+		fill = ' ';
+		nogrp = 0;
+		negpar = 0;
+		nosym = 0;
+		left = 0;
+		for (;; fmt++) {
+			switch (*fmt) {
+			case '=':
+				fill = *++fmt;
+				continue;
+			case '^':
+				nogrp = 1;
+				continue;
+			case '(':
+				negpar = 1;
+			case '+':
+				continue;
+			case '!':
+				nosym = 1;
+				continue;
+			case '-':
+				left = 1;
+				continue;
+			}
+			break;
+		}
+
+		for (fw = 0; isdigit(*fmt); fmt++)
+			fw = 10 * fw + (*fmt - '0');
+		lp = 0;
+		rp = 2;
+		if (*fmt == '#')
+			for (lp = 0, fmt++; isdigit(*fmt); fmt++)
+				lp = 10 * lp + (*fmt - '0');
+		if (*fmt == '.')
+			for (rp = 0, fmt++; isdigit(*fmt); fmt++)
+				rp = 10 * rp + (*fmt - '0');
+
+		intl = *fmt++ == 'i';
+
+		w = lp + 1 + rp;
+		if (!left && fw > w)
+			w = fw;
+
+		x = va_arg(ap, double);
+		l = snprintf(s, n, "%*.*f", w, rp, x);
+		if (l >= n) {
+			errno = E2BIG;
+			return -1;
+		}
+		s += l;
+		n -= l;
+	}
+	return s - s0;
+}
+
+ssize_t strfmon(char *restrict s, size_t n, const char *restrict fmt, ...)
+{
+	va_list ap;
+	ssize_t ret;
+
+	va_start(ap, fmt);
+	ret = vstrfmon_l(s, n, fmt, ap);
+	va_end(ap);
+
+	return ret;
+}
+
+weak ssize_t strfmon_l(char *restrict s, size_t n, locale_t unused loc,
+		       const char *restrict fmt, ...)
+{
+	va_list ap;
+	ssize_t ret;
+
+	va_start(ap, fmt);
+	ret = vstrfmon_l(s, n, fmt, ap);
+	va_end(ap);
+
+	return ret;
+}