ssize_t getdelim(char **linep, size_t *linecapp,
int delimiter, FILE *stream);
ssize_t getline(char **linep, size_t *linecapp,
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 reached.
The caller may provide a pointer to a malloced buffer for the line in
*linep, and the capacity 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.
These functions may fail if either linep or linecapp is
NULL then errno is set to EINVAL, or no delimiter
was found in teh first SSIZE_MAX characters in which case errno is set to EOVERFLOW.
These functions may also fail due to any of the errors specified for
fgets() and malloc().
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;
while ((linelen = getline(&line, &linecap, fp)) > 0)
fwrite(line, linelen, 1, stdout);
The getdelim() and getline() functions conform to IEEE Std 1003.1-2008 'POSIX.1'
Many application writers used the name getline before the getline() function
was introduced in 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' environment 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
prior to the inclusion of <stdio.h> will also make getline()
PTC MKS Toolkit for Professional Developers
PTC MKS Toolkit for Professional Developers 64-Bit Edition
PTC MKS Toolkit for Enterprise Developers
PTC MKS Toolkit for Enterprise Developers 64-Bit Edition
- fgetln(), fgets(), malloc()
PTC MKS Toolkit 10.3 Documentation Build 39.