Diff: itoa.c

Revision:

0:5952bbaff1c6

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/itoa.c	Mon Apr 26 14:52:27 2021 +0000
@@ -0,0 +1,168 @@
+/*
+  Copyright (c) 2011 Arduino.  All right reserved.
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the GNU Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#include "itoa.h"
+#include <string.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif // __cplusplus
+
+#if 0
+/* reverse:  reverse string s in place */
+static void reverse(char s[])
+{
+  int i, j ;
+  char c ;
+
+  for (i = 0, j = strlen(s) - 1 ; i < j ; i++, j--) {
+    c = s[i] ;
+    s[i] = s[j] ;
+    s[j] = c ;
+  }
+}
+
+/* itoa:  convert n to characters in s */
+extern void itoa(int n, char s[])
+{
+  int i, sign ;
+
+  if ((sign = n) < 0) {  /* record sign */
+    n = -n;          /* make n positive */
+  }
+
+  i = 0;
+  do {
+    /* generate digits in reverse order */
+    s[i++] = n % 10 + '0';   /* get next digit */
+  } while ((n /= 10) > 0) ;     /* delete it */
+
+  if (sign < 0) {
+    s[i++] = '-';
+  }
+
+  s[i] = '\0';
+
+  reverse(s) ;
+}
+
+#else
+
+extern char *itoa(int value, char *string, int radix)
+{
+  return ltoa(value, string, radix) ;
+}
+
+extern char *ltoa(long value, char *string, int radix)
+{
+  char tmp[33];
+  char *tp = tmp;
+  long i;
+  unsigned long v;
+  int sign;
+  char *sp;
+
+  if (string == NULL) {
+    return 0 ;
+  }
+
+  if (radix > 36 || radix <= 1) {
+    return 0 ;
+  }
+
+  sign = (radix == 10 && value < 0);
+  if (sign) {
+    v = -value;
+  } else {
+    v = (unsigned long)value;
+  }
+
+  while (v || tp == tmp) {
+    i = v % radix;
+    v = v / radix;
+    if (i < 10) {
+      *tp++ = i + '0';
+    } else {
+      *tp++ = i + 'a' - 10;
+    }
+  }
+
+  sp = string;
+
+  if (sign) {
+    *sp++ = '-';
+  }
+  while (tp > tmp) {
+    *sp++ = *--tp;
+  }
+  *sp = 0;
+
+  return string;
+}
+#if __GNUC__ > 4 || (__GNUC__ == 4 && (__GNUC_MINOR__ > 9 || \
+   (__GNUC_MINOR__ == 9 && __GNUC_PATCHLEVEL__ > 2)))
+extern char *utoa(unsigned value, char *string, int radix)
+#else
+extern char *utoa(unsigned long value, char *string, int radix)
+#endif
+{
+  return ultoa(value, string, radix) ;
+}
+
+extern char *ultoa(unsigned long value, char *string, int radix)
+{
+  char tmp[33];
+  char *tp = tmp;
+  long i;
+  unsigned long v = value;
+  char *sp;
+
+  if (string == NULL) {
+    return 0;
+  }
+
+  if (radix > 36 || radix <= 1) {
+    return 0;
+  }
+
+  while (v || tp == tmp) {
+    i = v % radix;
+    v = v / radix;
+    if (i < 10) {
+      *tp++ = i + '0';
+    } else {
+      *tp++ = i + 'a' - 10;
+    }
+  }
+
+  sp = string;
+
+
+  while (tp > tmp) {
+    *sp++ = *--tp;
+  }
+  *sp = 0;
+
+  return string;
+}
+#endif /* 0 */
+
+#ifdef __cplusplus
+} // extern "C"
+#endif // __cplusplus
+