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tolower(3c)

tolower(3C)              Standard C Library Functions              tolower(3C)

NAME
       tolower, tolower_l - transliterate uppercase characters to lowercase

SYNOPSIS
       #include <ctype.h>

       int tolower(int c);
       int tolower_l(int c, locale_t locale);

DESCRIPTION
       The  tolower()  and  tolower_l() functions have as a domain a type int,
       the value of which is representable as an unsigned char or the value of
       EOF. If the argument has any other value, the argument is returned  un‐
       changed.  The  tolower() function operates in the current locale as set
       by setlocale(3C), while tolower_l() uses the locale represented by  the
       locale argument.


       If  the  argument  of  tolower() or tolower_l() represents an uppercase
       letter, and there exists a corresponding lowercase letter as defined by
       character type information in the locale category LC_CTYPE, the  result
       is  the  corresponding lowercase letter. All other arguments in the do‐
       main are returned unchanged.


       The behavior is undefined if the locale argument to tolower_l() is  the
       special  locale object LC_GLOBAL_LOCALE or is not a valid locale object
       handle.

RETURN VALUES
       On successful completion, tolower() and tolower_l() return  the  lower‐
       case  letter  corresponding to the argument passed. Otherwise, they re‐
       turn the argument unchanged.

ERRORS
       No errors are defined.

ATTRIBUTES
       See attributes(7) for descriptions of the following attributes:

       tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE  TYPEAT‐
       TRIBUTE  VALUE _ CSIEnabled _ Interface StabilityStandard _ MT-LevelMT-
       Safe


SEE ALSO
       _tolower(3C),  toupper(3C),   duplocale(3C),   freelocale(3C),   newlo‐
       cale(3C), setlocale(3C), uselocale(3C), attributes(7), standards(7)

Oracle Solaris 11.4               11 May 2021                      tolower(3C)
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