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Source Code
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#include <stdio.h>
#include <string.h>
int scanf_solo_int(int *p)
{
// read integer
int ret = scanf("%d", p);
if(ret == EOF) return -1;
// read rest of line
char s[132 + 1];
if(scanf("%132[^\n]", s) != 1) s[0] = '\0';
scanf("%*1[\n]");
if(ret == 1)
{
// check for extra non-whitespace
if(s[strspn(s, " \t\n")] != '\0') ret = 2;
}
return ret;
}
int main()
{
for(;;)
{
int n;
switch(scanf_solo_int(&n))
{
case 1: printf("ok: %d\n", n); continue;
case 0: printf("error: not a number\n"); continue;
case 2: printf("error: extra characters past %d\n", n); continue;
case -1: printf("error: EOF\n"); break;
default: printf("error: unexpected\n"); break;
}
break;
}
return 0;
}
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