1STRCASECMP(3P) POSIX Programmer's Manual STRCASECMP(3P)
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6 This manual page is part of the POSIX Programmer's Manual. The Linux
7 implementation of this interface may differ (consult the corresponding
8 Linux manual page for details of Linux behavior), or the interface may
9 not be implemented on Linux.
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12 strcasecmp, strncasecmp - case-insensitive string comparisons
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15 #include <strings.h>
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17 int strcasecmp(const char *s1, const char *s2);
18 int strncasecmp(const char *s1, const char *s2, size_t n);
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22 The strcasecmp() function shall compare, while ignoring differences in
23 case, the string pointed to by s1 to the string pointed to by s2. The
24 strncasecmp() function shall compare, while ignoring differences in
25 case, not more than n bytes from the string pointed to by s1 to the
26 string pointed to by s2.
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28 In the POSIX locale, strcasecmp() and strncasecmp() shall behave as if
29 the strings had been converted to lowercase and then a byte comparison
30 performed. The results are unspecified in other locales.
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33 Upon completion, strcasecmp() shall return an integer greater than,
34 equal to, or less than 0, if the string pointed to by s1 is, ignoring
35 case, greater than, equal to, or less than the string pointed to by s2,
36 respectively.
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38 Upon successful completion, strncasecmp() shall return an integer
39 greater than, equal to, or less than 0, if the possibly null-terminated
40 array pointed to by s1 is, ignoring case, greater than, equal to, or
41 less than the possibly null-terminated array pointed to by s2, respecā
42 tively.
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45 No errors are defined.
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47 The following sections are informative.
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50 None.
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62 The Base Definitions volume of IEEE Std 1003.1-2001, <strings.h>
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65 Portions of this text are reprinted and reproduced in electronic form
66 from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
67 -- Portable Operating System Interface (POSIX), The Open Group Base
68 Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
69 Electrical and Electronics Engineers, Inc and The Open Group. In the
70 event of any discrepancy between this version and the original IEEE and
71 The Open Group Standard, the original IEEE and The Open Group Standard
72 is the referee document. The original Standard can be obtained online
73 at http://www.opengroup.org/unix/online.html .
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77IEEE/The Open Group 2003 STRCASECMP(3P)