yasar yasar - 13 days ago 6
C Question

"assignment discards 'const' qualifier" error on non-const pointer

In the following function:

char *mystrtok(const char *input, const char *delim,char *rest) {
int i;
for (i = 0; input[i] != *delim && input[i] != '\0'; ++i) {
continue;
}
char *result = malloc(sizeof(char) * (i + 2));
memcpy(result, input, i + 1);
result[i + 1] = '\0';
if (input[i + 1] != '\0')
rest = input + i + 2;
else
rest = NULL;
return result;
}


I am getting
assignment discards 'const' qualifier from pointer target type
for the line
rest = input + i + 2
, however, as you can see, rest is not a constant pointer. What am I doing wrong here?

Answer

input is a pointer to a constant char, and you're assigning it to a pointer to a non-constant char. This here might be an interesting reading for you.

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