STRCASECMP(3)              POSIX Programmer's Manual             STRCASECMP(3)



PPRROOLLOOGG
       This manual page is part of the POSIX Programmer's Manual.  The OS
       implementation of this interface may differ (consult the corresponding
       OS manual page for details of OS behavior), or the interface may not be
       implemented on OS.

NNAAMMEE
       strcasecmp, strcasecmp_l, strncasecmp, strncasecmp_l -- case-
       insensitive string comparisons

SSYYNNOOPPSSIISS
       #include <strings.h>

       int strcasecmp(const char *_s_1, const char *_s_2);
       int strcasecmp_l(const char *_s_1, const char *_s_2,
           locale_t _l_o_c_a_l_e);
       int strncasecmp(const char *_s_1, const char *_s_2, size_t _n);
       int strncasecmp_l(const char *_s_1, const char *_s_2,
           size_t _n, locale_t _l_o_c_a_l_e);

DDEESSCCRRIIPPTTIIOONN
       The _s_t_r_c_a_s_e_c_m_p() and _s_t_r_c_a_s_e_c_m_p___l() functions shall compare, while
       ignoring differences in case, the string pointed to by _s_1 to the string
       pointed to by _s_2.  The _s_t_r_n_c_a_s_e_c_m_p() and _s_t_r_n_c_a_s_e_c_m_p___l() functions
       shall compare, while ignoring differences in case, not more than _n
       bytes from the string pointed to by _s_1 to the string pointed to by _s_2.

       The _s_t_r_c_a_s_e_c_m_p() and _s_t_r_n_c_a_s_e_c_m_p() functions use the current locale to
       determine the case of the characters.

       The _s_t_r_c_a_s_e_c_m_p___l() and _s_t_r_n_c_a_s_e_c_m_p___l() functions use the locale
       represented by _l_o_c_a_l_e to determine the case of the characters.

       When the _L_C___C_T_Y_P_E category of the locale being used is from the POSIX
       locale, these functions shall behave as if the strings had been
       converted to lowercase and then a byte comparison performed. Otherwise,
       the results are unspecified.

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

RREETTUURRNN VVAALLUUEE
       Upon completion, _s_t_r_c_a_s_e_c_m_p() and _s_t_r_c_a_s_e_c_m_p___l() shall return an
       integer greater than, equal to, or less than 0, if the string pointed
       to by _s_1 is, ignoring case, greater than, equal to, or less than the
       string pointed to by _s_2, respectively.

       Upon successful completion, _s_t_r_n_c_a_s_e_c_m_p() and _s_t_r_n_c_a_s_e_c_m_p___l() shall
       return an integer greater than, equal to, or less than 0, if the
       possibly null-terminated array pointed to by _s_1 is, ignoring case,
       greater than, equal to, or less than the possibly null-terminated array
       pointed to by _s_2, respectively.

EERRRROORRSS
       No errors are defined.

       _T_h_e _f_o_l_l_o_w_i_n_g _s_e_c_t_i_o_n_s _a_r_e _i_n_f_o_r_m_a_t_i_v_e_.

EEXXAAMMPPLLEESS
       None.

AAPPPPLLIICCAATTIIOONN UUSSAAGGEE
       None.

RRAATTIIOONNAALLEE
       None.

FFUUTTUURREE DDIIRREECCTTIIOONNSS
       None.

SSEEEE AALLSSOO
       _w_c_s_c_a_s_e_c_m_p()

       The Base Definitions volume of POSIX.1-2017, <<ssttrriinnggss..hh>>

CCOOPPYYRRIIGGHHTT
       Portions of this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1-2017, Standard for Information Technology --
       Portable Operating System Interface (POSIX), The Open Group Base
       Specifications Issue 7, 2018 Edition, Copyright (C) 2018 by the
       Institute of Electrical and Electronics Engineers, Inc and The Open
       Group.  In the event of any discrepancy between this version and the
       original IEEE and The Open Group Standard, the original IEEE and The
       Open Group Standard is the referee document. The original Standard can
       be obtained online at http://www.opengroup.org/unix/online.html .

       Any typographical or formatting errors that appear in this page are
       most likely to have been introduced during the conversion of the source
       files to man page format. To report such errors, see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .



IEEE/The Open Group                  2017                        STRCASECMP(3)
