src/stdlib/strtod.c

   1 #include <stdlib.h>
   2 #include "shgetc.h"
   3 #include "floatscan.h"
   4 #include "stdio_impl.h"
   5
   6 static long double strtox(const char *s, char **p, int prec)
   7 {
   8         FILE f;
   9         sh_fromstring(&f, s);
  10         shlim(&f, 0);
  11         long double y = __floatscan(&f, prec, 1);
  12         off_t cnt = shcnt(&f);
  13         if (p) *p = cnt ? (char *)s + cnt : (char *)s;
  14         return y;
  15 }
  16
  17 float strtof(const char *restrict s, char **restrict p)
  18 {
  19         return strtox(s, p, 0);
  20 }
  21
  22 double strtod(const char *restrict s, char **restrict p)
  23 {
  24         return strtox(s, p, 1);
  25 }
  26
  27 long double strtold(const char *restrict s, char **restrict p)
  28 {
  29         return strtox(s, p, 2);
  30 }