mirror of
https://github.com/u-boot/u-boot.git
synced 2024-11-30 08:03:32 +08:00
1a4596601f
Signed-off-by: Wolfgang Denk <wd@denx.de> [trini: Fixup common/cmd_io.c] Signed-off-by: Tom Rini <trini@ti.com>
91 lines
2.2 KiB
C
91 lines
2.2 KiB
C
/* getline.c -- Replacement for GNU C library function getline
|
|
*
|
|
* Copyright (C) 1993, 1996, 2001, 2002 Free Software Foundation, Inc.
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
/* Written by Jan Brittenson, bson@gnu.ai.mit.edu. */
|
|
|
|
#include <assert.h>
|
|
#include <stdio.h>
|
|
|
|
/* Always add at least this many bytes when extending the buffer. */
|
|
#define MIN_CHUNK 64
|
|
|
|
/* Read up to (and including) a TERMINATOR from STREAM into *LINEPTR
|
|
+ OFFSET (and null-terminate it). *LINEPTR is a pointer returned from
|
|
malloc (or NULL), pointing to *N characters of space. It is realloc'd
|
|
as necessary. Return the number of characters read (not including the
|
|
null terminator), or -1 on error or EOF.
|
|
NOTE: There is another getstr() function declared in <curses.h>. */
|
|
static int getstr(char **lineptr, size_t *n, FILE *stream,
|
|
char terminator, size_t offset)
|
|
{
|
|
int nchars_avail; /* Allocated but unused chars in *LINEPTR. */
|
|
char *read_pos; /* Where we're reading into *LINEPTR. */
|
|
int ret;
|
|
|
|
if (!lineptr || !n || !stream)
|
|
return -1;
|
|
|
|
if (!*lineptr) {
|
|
*n = MIN_CHUNK;
|
|
*lineptr = malloc(*n);
|
|
if (!*lineptr)
|
|
return -1;
|
|
}
|
|
|
|
nchars_avail = *n - offset;
|
|
read_pos = *lineptr + offset;
|
|
|
|
for (;;) {
|
|
register int c = getc(stream);
|
|
|
|
/* We always want at least one char left in the buffer, since we
|
|
always (unless we get an error while reading the first char)
|
|
NUL-terminate the line buffer. */
|
|
|
|
assert(*n - nchars_avail == read_pos - *lineptr);
|
|
if (nchars_avail < 2) {
|
|
if (*n > MIN_CHUNK)
|
|
*n *= 2;
|
|
else
|
|
*n += MIN_CHUNK;
|
|
|
|
nchars_avail = *n + *lineptr - read_pos;
|
|
*lineptr = realloc(*lineptr, *n);
|
|
if (!*lineptr)
|
|
return -1;
|
|
read_pos = *n - nchars_avail + *lineptr;
|
|
assert(*n - nchars_avail == read_pos - *lineptr);
|
|
}
|
|
|
|
if (c == EOF || ferror (stream)) {
|
|
/* Return partial line, if any. */
|
|
if (read_pos == *lineptr)
|
|
return -1;
|
|
else
|
|
break;
|
|
}
|
|
|
|
*read_pos++ = c;
|
|
nchars_avail--;
|
|
|
|
if (c == terminator)
|
|
/* Return the line. */
|
|
break;
|
|
}
|
|
|
|
/* Done - NUL terminate and return the number of chars read. */
|
|
*read_pos = '\0';
|
|
|
|
ret = read_pos - (*lineptr + offset);
|
|
return ret;
|
|
}
|
|
|
|
int getline (char **lineptr, size_t *n, FILE *stream)
|
|
{
|
|
return getstr(lineptr, n, stream, '\n', 0);
|
|
}
|