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FreeBSD 11.0 - man page for getline (freebsd section 3)

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GETLINE(3)			   BSD Library Functions Manual 		       GETLINE(3)

     getdelim, getline -- get a line from a stream

     Standard C Library (libc, -lc)

     #define _WITH_GETLINE
     #include <stdio.h>

     getdelim(char ** restrict linep, size_t * restrict linecapp, int delimiter,
	 FILE * restrict stream);

     getline(char ** restrict linep, size_t * restrict linecapp, FILE * restrict stream);

     The getdelim() function reads a line from stream, delimited by the character delimiter.  The
     getline() function is equivalent to getdelim() with the newline character as the delimiter.
     The delimiter character is included as part of the line, unless the end of the file is

     The caller may provide a pointer to a malloced buffer for the line in *linep, and the capac-
     ity of that buffer in *linecapp.  These functions expand the buffer as needed, as if via
     realloc().  If linep points to a NULL pointer, a new buffer will be allocated.  In either
     case, *linep and *linecapp will be updated accordingly.

     The getdelim() and getline() functions return the number of characters stored in the buffer,
     excluding the terminating NUL character.  The value -1 is returned if an error occurs, or if
     end-of-file is reached.

     The following code fragment reads lines from a file and writes them to standard output.  The
     fwrite() function is used in case the line contains embedded NUL characters.

	   char *line = NULL;
	   size_t linecap = 0;
	   ssize_t linelen;
	   while ((linelen = getline(&line, &linecap, fp)) > 0)
		   fwrite(line, linelen, 1, stdout);

     Many application writers used the name getline before the getline() function was introduced
     in IEEE Std 1003.1 (``POSIX.1''), so a prototype is not provided by default in order to
     avoid compatibility problems.  Applications that wish to use the getline() function
     described herein should either request a strict IEEE Std 1003.1-2008 (``POSIX.1'') environ-
     ment by defining the macro _POSIX_C_SOURCE to the value 200809 or greater, or by defining
     the macro _WITH_GETLINE, prior to the inclusion of <stdio.h>.  For compatibility with GNU
     libc, defining either _BSD_SOURCE or _GNU_SOURCE prior to the inclusion of <stdio.h> will
     also make getline() available.

     These functions may fail if:

     [EINVAL]		Either linep or linecapp is NULL.

     [EOVERFLOW]	No delimiter was found in the first SSIZE_MAX characters.

     These functions may also fail due to any of the errors specified for fgets() and malloc().

     fgetln(3), fgets(3), malloc(3)

     The getdelim() and getline() functions conform to IEEE Std 1003.1-2008 (``POSIX.1'').

     These routines first appeared in FreeBSD 8.0.

     There are no wide character versions of getdelim() or getline().

BSD					November 30, 2012				      BSD
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