defensive-coding-guide/en-US/snippets/C-Pointers-remaining.xml

49 lines
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XML

<?xml version='1.0' encoding='utf-8' ?>
<!DOCTYPE programlisting PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
]>
<!-- Automatically generated file. Do not edit. -->
<programlisting language="C">
ssize_t
extract_strings(const char *in, size_t inlen, char **out, size_t outlen)
{
const char *inp = in;
const char *inend = in + inlen;
char **outp = out;
char **outend = out + outlen;
while (inp != inend) {
size_t len;
char *s;
if (outp == outend) {
errno = ENOSPC;
goto err;
}
len = (unsigned char)*inp;
++inp;
if (len &#62; (size_t)(inend - inp)) {
errno = EINVAL;
goto err;
}
s = malloc(len + 1);
if (s == NULL) {
goto err;
}
memcpy(s, inp, len);
inp += len;
s[len] = '\0';
*outp = s;
++outp;
}
return outp - out;
err:
{
int errno_old = errno;
while (out != outp) {
free(*out);
++out;
}
errno = errno_old;
}
return -1;
}
</programlisting>