Function local_getline

tools/shell/shell.cpp:524–555

** This routine reads a line of text from FILE in, stores ** the text in memory obtained from malloc() and returns a pointer ** to the text. NULL is returned at end of file, or if malloc() ** fails. ** ** If zLine is not NULL then it is a malloced buffer returned from ** a previous call to this routine that may be reused. */

** a previous call to this routine that may be reused.
*/
static char *local_getline(char *zLine, FILE *in) {
	idx_t nLine = zLine == 0 ? 0 : 100;
	idx_t n = 0;

	while (1) {
		if (n + 100 > nLine) {
			nLine = nLine * 2 + 100;
			zLine = (char *)realloc(zLine, nLine);
			if (!zLine) {
				shell_out_of_memory();
			}
		}
		if (fgets(&zLine[n], nLine - n, in) == 0) {
			if (n == 0) {
				free(zLine);
				return 0;
			}
			zLine[n] = 0;
			break;
		}
		while (zLine[n])
			n++;
		if (n > 0 && zLine[n - 1] == '\n') {
			n--;
			if (n > 0 && zLine[n - 1] == '\r')
				n--;
			zLine[n] = 0;
			break;
		}
	}
	return zLine;
}

/*
** Retrieve a single line of input text.