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https://github.com/python/cpython
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97eaf2b5e5
* bpo-41524: fix pointer bug in PyOS_mystr{n}icmp
The existing implementations of PyOS_mystrnicmp and PyOS_mystricmp
can increment pointers beyond the end of a string.
This commit fixes those cases by moving the mutation out of the condition.
* 📜🤖 Added by blurb_it.
* Address comments
Co-authored-by: blurb-it[bot] <43283697+blurb-it[bot]@users.noreply.github.com>
30 lines
753 B
C
30 lines
753 B
C
/* Cross platform case insensitive string compare functions
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*/
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#include "Python.h"
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int
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PyOS_mystrnicmp(const char *s1, const char *s2, Py_ssize_t size)
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{
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const unsigned char *p1, *p2;
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if (size == 0)
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return 0;
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p1 = (const unsigned char *)s1;
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p2 = (const unsigned char *)s2;
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for (; (--size > 0) && *p1 && *p2 && (tolower(*p1) == tolower(*p2));
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p1++, p2++) {
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;
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}
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return tolower(*p1) - tolower(*p2);
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}
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int
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PyOS_mystricmp(const char *s1, const char *s2)
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{
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const unsigned char *p1 = (const unsigned char *)s1;
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const unsigned char *p2 = (const unsigned char *)s2;
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for (; *p1 && *p2 && (tolower(*p1) == tolower(*p2)); p1++, p2++) {
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;
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}
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return (tolower(*p1) - tolower(*p2));
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}
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