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GETDELIM(3)                Library Functions Manual                GETDELIM(3)

     getdelim, getline -- read a delimited record from a stream

     Standard C Library (libc, -lc)

     #include <stdio.h>

     getdelim(char ** restrict lineptr, size_t * restrict n, int delimiter,
         FILE * restrict stream);

     getline(char ** restrict lineptr, size_t * restrict n,
         FILE * restrict stream);

     The getdelim() function reads from the stream until it encounters a
     character matching delimiter, storing the input in *lineptr.  The buffer
     is NUL-terminated and includes the delimiter.  The delimiter character
     must be representable as an unsigned char.

     If *n is non-zero, then *lineptr must be pre-allocated to at least *n
     bytes.  The buffer should be allocated dynamically; it must be possible
     to free(3) *lineptr.  getdelim() ensures that *lineptr is large enough to
     hold the input, updating *n to reflect the new size.

     The getline() function is equivalent to getdelim() with delimiter set to
     the newline character.

     The getdelim() and getline() functions return the number of characters
     read, including the delimiter.  If no characters were read and the stream
     is at end-of-file, the functions return -1.  If an error occurs, the
     functions return -1 and the global variable errno is set to indicate the

     The functions do not distinguish between end-of-file and error, and
     callers must use feof(3) and ferror(3) to determine which occurred.

     The following code fragment reads lines from a file and writes them to
     standard output.

           char *line = NULL;
           size_t linesize = 0;
           ssize_t linelen;

           while ((linelen = getline(&line, &linesize, fp)) != -1)
                   fwrite(line, linelen, 1, stdout);

           if (ferror(fp))

     [EINVAL]     lineptr or n is a NULL pointer.

     [EOVERFLOW]  More than SSIZE_MAX characters were read without
                  encountering the delimiter.

     The getdelim() and getline() functions may also fail and set errno for
     any of the errors specified in the routines fflush(3), malloc(3),
     read(2), stat(2), or realloc(3).

     ferror(3), fgets(3), fopen(3)

     The getdelim() and getline() functions conform to IEEE Std 1003.1-2008

NetBSD 7.1.2                     June 30, 2010                    NetBSD 7.1.2