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/* Portable version of strchr()
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This function is in the public domain. */
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@deftypefn Supplemental char* strchr (const char *@var{s}, int @var{c})
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Returns a pointer to the first occurrence of the character @var{c} in
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the string @var{s}, or @code{NULL} if not found. If @var{c} is itself the
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null character, the results are undefined.
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strchr (register const char *s, int c)