newlib/libc/stdlib/atoi.c

   1 /*
   2 FUNCTION
   3    <<atoi>>, <<atol>>---string to integer
   4
   5 INDEX
   6         atoi
   7 INDEX
   8         atol
   9 INDEX
  10         _atoi_r
  11 INDEX
  12         _atol_r
  13
  14 SYNOPSIS
  15         #include <stdlib.h>
  16         int atoi(const char *<[s]>);
  17         long atol(const char *<[s]>);
  18         int _atoi_r(struct _reent *<[ptr]>, const char *<[s]>);
  19         long _atol_r(struct _reent *<[ptr]>, const char *<[s]>);
  20
  21 DESCRIPTION
  22    <<atoi>> converts the initial portion of a string to an <<int>>.
  23    <<atol>> converts the initial portion of a string to a <<long>>.
  24
  25    <<atoi(s)>> is implemented as <<(int)strtol(s, NULL, 10).>>
  26    <<atol(s)>> is implemented as <<strtol(s, NULL, 10).>>
  27
  28    <<_atoi_r>> and <<_atol_r>> are reentrant versions of <<atoi>> and
  29    <<atol>> respectively, passing the reentrancy struct pointer.
  30
  31 RETURNS
  32    The functions return the converted value, if any. If no conversion was
  33    made, <<0>> is returned.
  34
  35 PORTABILITY
  36 <<atoi>>, <<atol>> are ANSI.
  37
  38 No supporting OS subroutines are required.
  39 */
  40
  41 /*
  42  * Andy Wilson, 2-Oct-89.
  43  */
  44
  45 #include <stdlib.h>
  46 #include <_ansi.h>
  47
  48 #ifndef _REENT_ONLY
  49 int
  50 atoi (const char *s)
  51 {
  52   return (int) strtol (s, NULL, 10);
  53 }
  54 #endif /* !_REENT_ONLY */
  55
  56 int
  57 _atoi_r (struct _reent *ptr,
  58         const char *s)
  59 {
  60   return (int) _strtol_r (ptr, s, NULL, 10);
  61 }
  62