$home/manuals/unix_v7/3/string

STRING(3)                  Library Functions Manual                  STRING(3)



NAME
       strcat,  strncat,  strcmp,  strncmp,  strcpy,  strncpy,  strlen, index,
       rindex - string operations

SYNOPSIS
       char *strcat(s1, s2)
       char *s1, *s2;

       char *strncat(s1, s2, n)
       char *s1, *s2;

       strcmp(s1, s2)
       char *s1, *s2;

       strncmp(s1, s2, n)
       char *s1, *s2;

       char *strcpy(s1, s2)
       char *s1, *s2;

       char *strncpy(s1, s2, n)
       char *s1, *s2;

       strlen(s)
       char *s;

       char *index(s, c)
       char *s, c;

       char *rindex(s, c)
       char *s;

DESCRIPTION
       These functions operate on null-terminated strings.  They do not  check
       for overflow of any receiving string.

       Strcat  appends  a  copy of string s2 to the end of string s1.  Strncat
       copies at most n characters.  Both return a pointer to the  null-termi‐
       nated result.

       Strcmp  compares  its  arguments  and  returns an integer greater than,
       equal to, or less than 0, according as s1 is lexicographically  greater
       than, equal to, or less than s2.  Strncmp makes the same comparison but
       looks at at most n characters.

       Strcpy copies string s2 to s1, stopping after the  null  character  has
       been  moved.   Strncpy copies exactly n characters, truncating or null-
       padding s2; the target may not be null-terminated if the length  of  s2
       is n or more.  Both return s1.

       Strlen returns the number of non-null characters in s.

       Index  (rindex)  returns  a  pointer  to the first (last) occurrence of
       character c in string s, or zero if c does not occur in  the string.

BUGS
       Strcmp uses native character comparison, which is  signed  on  PDP11's,
       unsigned on other machines.



                                                                     STRING(3)