1TOLOWER(P) POSIX Programmer's Manual TOLOWER(P)
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6 tolower - transliterate uppercase characters to lowercase
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9 #include <ctype.h>
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11 int tolower(int c);
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15 The tolower() function has as a domain a type int, the value of which
16 is representable as an unsigned char or the value of EOF. If the argu‐
17 ment has any other value, the behavior is undefined. If the argument of
18 tolower() represents an uppercase letter, and there exists a corre‐
19 sponding lowercase letter (as defined by character type information in
20 the program locale category LC_CTYPE ), the result shall be the corre‐
21 sponding lowercase letter. All other arguments in the domain are
22 returned unchanged.
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25 Upon successful completion, tolower() shall return the lowercase letter
26 corresponding to the argument passed; otherwise, it shall return the
27 argument unchanged.
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30 No errors are defined.
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32 The following sections are informative.
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35 None.
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38 None.
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41 None.
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44 None.
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47 setlocale() , the Base Definitions volume of IEEE Std 1003.1-2001,
48 Chapter 7, Locale, <ctype.h>
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51 Portions of this text are reprinted and reproduced in electronic form
52 from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
53 -- Portable Operating System Interface (POSIX), The Open Group Base
54 Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
55 Electrical and Electronics Engineers, Inc and The Open Group. In the
56 event of any discrepancy between this version and the original IEEE and
57 The Open Group Standard, the original IEEE and The Open Group Standard
58 is the referee document. The original Standard can be obtained online
59 at http://www.opengroup.org/unix/online.html .
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63IEEE/The Open Group 2003 TOLOWER(P)