SEI CERT C Coding Standard

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Old Version 40

changes.mady.by.user Pamela Curtis

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New Version 41

changes.mady.by.user Shaun Hedrick

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Code Block
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size_t count_preceding_whitespace(char const *s, size_t length) {
  char const *t = s;
  size_t length = strlen(s) + 1;

  /* possibly *t < 0 */
  while (isspace(*t) && (t - s < length)) {
    ++t;
  }
  return t - s;
}

Compliant Solution (Unsigned Char)

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Code Block
bgColor#ccccff
size_t count_preceding_whitespace(char const *s) {
  const unsigned char *t = s,;
  size_t length)
{
 = const unsigned char *t = s;strlen(s) + 1;

  while (isspace(*t) && (t - s < length)) {
    ++t;
  }
  return t - s;
}

Wiki Markup
This approach is inconvenient when you need to interwork with other functions that haven't been designed with this approach in mind, such as the string handling functions found in the standard library \[[Kettlewell 02|AA. C References#Kettlewell 02]\].

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Code Block
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size_t count_preceding_whitespace(char const *s) {
  char const *t = s,;
  size_t length)
{
 = char const *t = s;
strlen(s) + 1;

  while (isspace((unsigned char)*t) && (t - s < length)) {
    ++t;
  }
  return t - s;
}

Automated Detection

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