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This non-compliant code example may pass illegal values to the ctype functions.
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|---|---|---|
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size_t count_whitespace(const char *s) {
const char *t = s;
while(isspace(*t)) /* possibly *t < 0 */
++t;
return t - s;
}
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Pass character strings around explicitly using unsigned characters.
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|---|---|---|
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size_t count_whitespace(const unsigned *s) {
const unsigned char *t = s;
while(isspace(*t))
++t;
return t - s;
}
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This compliant solution uses an explicit cast.
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|---|---|---|
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size_t count_whitespace(const char *s) {
const char *t = s;
while(isspace((unsigned char)*t))
++t;
return t - s;
}
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