shithub: scc

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ref: dcdd9662fcdefba9fd4384714a327cad99786b8e
parent: 3b342595ee8598daefeb5cdf52e59aa29ddad468
author: Roberto E. Vargas Caballero <[email protected]>
date: Tue Nov 28 04:01:30 EST 2017 

[lib/c] Add atol() and atoll()

These functions could be integrated in only one, atoll, but
I prefer to keep the 3 versions to make the code simpler and
avoid the dependencies between different functions of the
library.


--- a/lib/c/src/Makefile
+++ b/lib/c/src/Makefile
@@ -9,7 +9,7 @@
       isalnum.o isalpha.o isascii.o isblank.o iscntrl.o isdigit.o \
       isgraph.o islower.o isprint.o ispunct.o isspace.o isupper.o \
       isxdigit.o toupper.o tolower.o ctype.o setlocale.o \
-      localeconv.o atoi.o atexit.o exit.o \
+      localeconv.o atoi.o atol.o atoll.o atexit.o exit.o \
       printf.o fprintf.o vfprintf.o \
       realloc.o calloc.o malloc.o
 
--- a/lib/c/src/atoi.c
+++ b/lib/c/src/atoi.c
@@ -7,10 +7,10 @@
 {
 	int n, sign = -1;
 
-	while(isspace(*s))
+	while (isspace(*s))
 		++s;
 
-	switch(*s) {
+	switch (*s) {
 	case '-':
 		sign = 1;
 	case '+':
--- /dev/null
+++ b/lib/c/src/atol.c
@@ -1,0 +1,27 @@
+#include <ctype.h>
+#include <stdlib.h>
+#undef atol
+
+long
+atol(const char *s)
+{
+	int sign = -1;
+	long n;
+
+	while (isspace(*s))
+		++s;
+
+	switch (*s) {
+	case '-':
+		sign = 1;
+	case '+':
+		++s;
+	}
+
+	/* Compute n as a negative number to avoid overflow on LONG_MIN */
+	for (n = 0; isdigit(*s); ++s)
+		n = 10*n - (*s - '0');
+
+	return sign * n;
+}
+
--- /dev/null
+++ b/lib/c/src/atoll.c
@@ -1,0 +1,27 @@
+#include <ctype.h>
+#include <stdlib.h>
+#undef atoll
+
+long long
+atoll(const char *s)
+{
+	int sign = -1;
+	long long n;
+
+	while (isspace(*s))
+		++s;
+
+	switch (*s) {
+	case '-':
+		sign = 1;
+	case '+':
+		++s;
+	}
+
+	/* Compute n as a negative number to avoid overflow on LLONG_MIN */
+	for (n = 0; isdigit(*s); ++s)
+		n = 10*n - (*s - '0');
+
+	return sign * n;
+}
+