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char* line[256];   // An array of 256 pointers, sizeof(line) == 2048

char line[256];   // An array of 256 chars, sizeof(line) == 256

newSVpv(line, sizeof(line))   // length($line) == 2048 (or 256)

newSVpv(line, strlen(line))   // length($line) == 3
  -or-
newSVpv(line, 0)   // length($line) == 3

char* line = NULL;
ssize_t line_size;
...

if (line)
    free(line);

    while (1) {
        // Actually allocates at least 256.
...

        ...
    }