scc

simple c99 compiler
git clone git://git.simple-cc.org/scc
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atoi.c (357B)

      1 #include <ctype.h>
      2 #include <stdlib.h>
      3 
      4 #include "../libc.h"
      5 
      6 #undef atoi
      7 
      8 int
      9 atoi(const char *s)
     10 {
     11 	int n, d, sign = -1;
     12 
     13 	while (isspace(*s))
     14 		++s;
     15 
     16 	switch (*s) {
     17 	case '-':
     18 		sign = 1;
     19 	case '+':
     20 		++s;
     21 	}
     22 
     23 	/* Compute n as a negative number to avoid overflow on INT_MIN */
     24 	for (n = 0; (d = _dtoi(*s)) < 10; ++s)
     25 		n = n*10 - d;
     26 
     27 	return sign * n;
     28 }