개요

• 솔라나라에 설명된 어플리케이션에 대해 맨 페이지를 찾아 출력한다.
• MAN 페이지에 대한 설명은 윈디하나의 솔라나라: MAN 페이지을 참고하자.
• svcadm(8)을 검색하려면 섹션에서 8 을 선택하고, 맨 페이지 이름에 svcadm을 입력하고 검색을 누른다.

strverscmp(3)

STRVERSCMP(3)              Linux Programmer's Manual             STRVERSCMP(3)

NAME
       strverscmp - compare two version strings

SYNOPSIS
       #define _GNU_SOURCE         /* See feature_test_macros(7) */
       #include <string.h>

       int strverscmp(const char *s1, const char *s2);

DESCRIPTION
       Often  one  has  files  jan1, jan2, ..., jan9, jan10, ...  and it feels
       wrong when ls(1) orders them jan1, jan10, ..., jan2, ..., jan9.  In or‐
       der to rectify this, GNU introduced the -v option to  ls(1),  which  is
       implemented using versionsort(3), which again uses strverscmp().

       Thus,  the  task of strverscmp() is to compare two strings and find the
       "right" order, while strcmp(3)  finds  only  the  lexicographic  order.
       This  function does not use the locale category LC_COLLATE, so is meant
       mostly for situations where the strings are expected to be in ASCII.

       What this function does is the following.  If both strings  are  equal,
       return  0.   Otherwise,  find  the  position between two bytes with the
       property that before it both strings are equal, while directly after it
       there is a difference.  Find the largest consecutive digit strings con‐
       taining (or starting at, or ending at) this position.  If one  or  both
       of  these is empty, then return what strcmp(3) would have returned (nu‐
       merical ordering  of  byte  values).   Otherwise,  compare  both  digit
       strings numerically, where digit strings with one or more leading zeros
       are  interpreted  as  if they have a decimal point in front (so that in
       particular digit strings with more  leading  zeros  come  before  digit
       strings  with fewer leading zeros).  Thus, the ordering is 000, 00, 01,
       010, 09, 0, 1, 9, 10.

RETURN VALUE
       The strverscmp() function returns an integer less than,  equal  to,  or
       greater  than  zero  if  s1 is found, respectively, to be earlier than,
       equal to, or later than s2.

ATTRIBUTES
       For an explanation of the terms  used  in  this  section,  see  attrib‐
       utes(7).  allbox; lb lb lb l l l.  Interface Attribute Value T{ strver‐
       scmp() T}   Thread safety  MT-Safe

CONFORMING TO
       This function is a GNU extension.

EXAMPLE
       The  program  below  can be used to demonstrate the behavior of strver‐
       scmp().  It uses strverscmp() to compare the two strings given  as  its
       command-line arguments.  An example of its use is the following:

           $ ./a.out jan1 jan10
           jan1 < jan10

   Program source

       #define _GNU_SOURCE
       #include <string.h>
       #include <stdio.h>
       #include <stdlib.h>

       int
       main(int argc, char *argv[])
       {
           int res;

           if (argc != 3) {
               fprintf(stderr, "Usage: %s <string1> <string2>\n", argv[0]);
               exit(EXIT_FAILURE);
           }

           res = strverscmp(argv[1], argv[2]);

           printf("%s %s %s\n", argv[1],
                   (res < 0) ? "<" : (res == 0) ? "==" : ">", argv[2]);

           exit(EXIT_SUCCESS);
       }

SEE ALSO
       rename(1), strcasecmp(3), strcmp(3), strcoll(3)

COLOPHON
       This  page  is  part of release 5.02 of the Linux man-pages project.  A
       description of the project, information about reporting bugs,  and  the
       latest     version     of     this    page,    can    be    found    at
       https://www.kernel.org/doc/man-pages/.

GNU                               2019-03-06                     STRVERSCMP(3)