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shared: add nm_is_ascii()
glib's is{alnum,alpha,ascii,...}() functions perform the check based on the current locale. Probably using isascii() would be fine anyway, but add a NM version that just checks that the upper bit is zero.
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#include <netinet/in.h>
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#include <netinet/in.h>
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static inline gboolean
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nm_is_ascii (char ch)
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{
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return ((uint8_t) ch) < 128;
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}
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/*****************************************************************************/
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/*****************************************************************************/
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pid_t nm_utils_gettid (void);
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pid_t nm_utils_gettid (void);
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