Manual Pages  — OPENPAM_READLINEV

If lineno is not NULL, the integer variable it points to is incremented every time a newline character is read. This includes quoted or escaped newline characters and the newline character at the end of the line.

If lenp is not NULL, the number of words on the line is stored in the variable to which it points.

The caller is responsible for freeing both the array and the individual strings by passing each of them to free(3).

If the end of the line was reached before any words were read, openpam_readlinev() returns a pointer to a dynamically allocated array containing a single NULL pointer.

The openpam_readlinev() function can fail and return NULL for one of four reasons:

• The end of the file was reached before any words were read; errno is zero, ferror(3) returns zero, and feof(3) returns a non-zero value.
• The end of the file was reached while a quote or backslash escape was in effect; errno is set to EINVAL, ferror(3) returns zero, and feof(3) returns a non-zero value.
• An error occurred while reading from the file; errno is non-zero, ferror(3) returns a non-zero value and feof(3) returns zero.
• A malloc(3) or realloc(3) call failed; errno is set to ENOMEM, ferror(3) returns a non-zero value, and feof(3) may or may not return a non-zero value.