From 3685977f307931b8e9a9c646e87ee91c3b52170a Mon Sep 17 00:00:00 2001
From: Alan Cox <alan@linux.intel.com>
Date: Sat, 13 Jun 2015 22:38:49 +0100
Subject: [PATCH] lib: add a smaller atoi

---
 Library/libs/Makefile     |  2 +-
 Library/libs/atoi_small.c | 29 +++++++++++++++++++++++++++++
 Library/tools/libclean    |  2 +-
 3 files changed, 31 insertions(+), 2 deletions(-)
 create mode 100644 Library/libs/atoi_small.c

diff --git a/Library/libs/Makefile b/Library/libs/Makefile
index e9416cf7..8b053867 100644
--- a/Library/libs/Makefile
+++ b/Library/libs/Makefile
@@ -18,7 +18,7 @@ SRC_CRT0NS = crt0nostdio$(PLATFORM).s
 OBJ_CRT0NS = $(SRC_CRT0NS:.s=.rel)
 SRC_ASM = enter.s
 OBJ_ASM = $(SRC_ASM:.s=.rel)
-SRC_C =  __argv.c abort.c asctime.c assert.c atexit.c
+SRC_C =  __argv.c abort.c asctime.c assert.c atexit.c atoi_small.c
 SRC_C += bcmp.c bcopy.c bsearch.c bzero.c calloc.c cfree.c clock.c closedir.c
 SRC_C += clock_gettime.c clock_getres.c clock_settime.c
 SRC_C += creat.c crypt.c ctime.c difftime.c err.c errno.c error.c
diff --git a/Library/libs/atoi_small.c b/Library/libs/atoi_small.c
new file mode 100644
index 00000000..aaf9c369
--- /dev/null
+++ b/Library/libs/atoi_small.c
@@ -0,0 +1,29 @@
+/*
+ *	An implementation of atoi avoiding longs and 8bit unfriendly
+ *	math
+ */
+#include <stdlib.h>
+#include <ctype.h>
+
+/**************************** atoi.c ****************************/
+int atoi(const char *str)
+{
+	int r = 0;
+	uint8_t minus = 0;
+
+	while(isspace(*str))
+		str++;
+	if (*str == '-') {
+		minus = 1;
+		str++;
+	}
+	while(*str) {
+		uint8_t c = *str++;
+		c -= '0';
+		if (c > 9)
+			break;
+		r = ((r << 2) + r) << 1;
+		r += c;
+	}
+	return minus ? - r : r;
+}
diff --git a/Library/tools/libclean b/Library/tools/libclean
index 1f7d7931..1a9fb044 100755
--- a/Library/tools/libclean
+++ b/Library/tools/libclean
@@ -23,5 +23,5 @@ cp ${SDCC_LIB}/z80/z80.lib tmp.lib
 sdar d tmp.lib putchar.rel heap.rel fstubs.rel errno.rel
 sdar d tmp.lib rand.rel _calloc.rel _malloc.rel _realloc.rel _free.rel
 sdar d tmp.lib printf_large.rel puts.rel gets.rel assert.rel time.rel
-sdar d tmp.lib tolower.rel toupper.rel _ltoa.rel _itoa.rel abs.rel
+sdar d tmp.lib tolower.rel toupper.rel _ltoa.rel _itoa.rel abs.rel atoi.rel
 mv tmp.lib sdccz80.lib
-- 
2.34.1