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     string(3c)                 DG/UX 4.30                  string(3c)



     NAME
          strcat, strncat, strcmp, strncmp, strcoll, strxfrm, strcpy,
          strncpy, strlen, strchr, strrchr, strpbrk, strspn, strcspn,
          strstr, strtok - string operations

     SYNOPSIS
          #include <string.h>

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

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

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

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

          int strcoll (s1, s2)
          char *s1, *s2;

          sizet strxfrm (s1, s2, n)
          char *s1, *s2;
          sizet n;

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

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

          sizet strlen (s)
          char *s;

          char *strchr (s, c)
          char *s;
          int c;

          char *strrchr (s, c)
          char *s;
          int c;

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

          sizet strspn (s1, s2)
          char *s1, *s2;



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     string(3c)                 DG/UX 4.30                  string(3c)



          sizet strcspn (s1, s2)
          char *s1, *s2;

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

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

     DESCRIPTION
          The arguments s1, s2 and s point to strings (arrays of
          characters terminated by a null character).  The functions
          strcat, strncat, strxfrm, strcpy, and strncpy all alter s1.
          These functions do not check for overflow of the array
          pointed to by s1.

          Strcat appends a copy of string s2 to the end of string s1.
          Strncat appends at most n characters.  Each returns a
          pointer to the null-terminated result.

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

          Strcoll is similar to strcmp, but interprets both strings as
          appropriate to the LC_COLLATE category of the current locale
          (see locale(3c)).

          Strxfrm transforms string s2 (possibly a multibyte string)
          according to the current locale, and places at most n
          characters of the resulting string (including the
          terminating null character) in s1. The transformation is
          such that strcmp applied to two transformed strings will
          yield the same result as strcoll applied to the
          untransformed strings.

          Strxfrm returns the length of the transformed string,
          excluding the terminating null character; if the returned
          value is n or more, the contents of s1 are indeterminate.

          The size of the array needed to hold the transformed string
          is

               1 + strxfrm(NULL, s2, 0)

          Strcpy copies string s2 to s1, stopping after the null
          character has been copied.  Strncpy copies exactly n
          characters, truncating s2 or adding null characters to s1 if
          necessary.  The result will not be null-terminated if the
          length of s2 is n or more.  Each function returns s1.



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     string(3c)                 DG/UX 4.30                  string(3c)



          Strlen returns the number of characters in s, not including
          the terminating null character.

          Strchr (strrchr) returns a pointer to the first (last)
          occurrence of character c in string s, or a NULL pointer if
          c is not in the string.  The null character terminating a
          string is considered to be part of the string.

          Strpbrk returns a pointer to the first occurrence in string
          s1 of any character from string s2, or a NULL pointer if no
          character from s2 exists in s1.

          Strspn (strcspn) returns the length of the initial segment
          of string s1, which consists entirely of characters from
          (not from) string s2.

          Strstr returns a pointer to the first occurrence in string
          s1 of the sequence of characters (excluding the terminating
          null character) in s2, or a NULL pointer if the sequence is
          not found.  Strstr returns s1 if s2 points to a zero-length
          string.

          Strtok considers the string s1 to consist of a sequence of
          zero or more text tokens separated by spans of one or more
          characters from the separator string s2. The first call
          (with pointer s1 specified) returns a pointer to the first
          character of the first token, and will have written a null
          character into s1 immediately following the returned token.
          The function keeps track of its position in the string
          between separate calls, so that subsequent calls (which must
          be made with the first argument a NULL pointer) will work
          through the string s1 immediately following that token.

          In this way, subsequent calls will work through the string
          s1 until no tokens remain.  The separator string s2 may be
          different from call to call.  When no token remains in s1, a
          NULL pointer is returned.

     NOTE
          All these functions are declared in the optional string.h
          header file.

     BUGS
          Strcmp and strncmp use native character comparison, which is
          signed on Data General MV-series, DEC PDP-11, and DEC VAX-11
          machines; it is unsigned on other machines.  Thus, the sign
          of the value returned when one of the characters has its
          high-order bit set is implementation-dependent.

          Character movement is performed differently in different
          implementations.  Thus overlapping moves may yield
          surprises.



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