Embedded Artistry libc
C Standard Library Support for Bare-metal Systems
atoi.c
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1 #include <ctype.h>
2 #include <stdbool.h>
3 #include <stdlib.h>
4 
5 int atoi(const char* str)
6 {
7  bool neg = false;
8  int val = 0;
9 
10  switch(*str)
11  {
12  case '-':
13  neg = true;
14  // intentional fallthrough to advance str
15  case '+':
16  str++;
17  }
18 
19  while(isdigit(*str))
20  {
21  val = (10 * val) + (*str++ - '0');
22  }
23 
24  return (neg ? -val : val);
25 }
atoi
int atoi(const char *str)
Interprets an integer value in a byte string pointed to by str.
Definition: atoi.c:5
isdigit
int isdigit(int ch)
Checks if the given character is a numeric character.
Definition: isdigit.c:5