6d4c9f8995
[ Upstream commit af76b2dec0984a079d8497bfa37d29a9b55932e1 ]
There are functions using __u64, so we need to have the linux/types.h
header otherwise we'll break when its not included before api/io.h.
Fixes: e95770af4c4a280f ("tools api: Add a lightweight buffered reading api")
Reviewed-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/lkml/ZWjDPL+IzPPsuC3X@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
116 lines
2.5 KiB
C
Executable file
116 lines
2.5 KiB
C
Executable file
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* Lightweight buffered reading library.
|
|
*
|
|
* Copyright 2019 Google LLC.
|
|
*/
|
|
#ifndef __API_IO__
|
|
#define __API_IO__
|
|
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
#include <linux/types.h>
|
|
|
|
struct io {
|
|
/* File descriptor being read/ */
|
|
int fd;
|
|
/* Size of the read buffer. */
|
|
unsigned int buf_len;
|
|
/* Pointer to storage for buffering read. */
|
|
char *buf;
|
|
/* End of the storage. */
|
|
char *end;
|
|
/* Currently accessed data pointer. */
|
|
char *data;
|
|
/* Set true on when the end of file on read error. */
|
|
bool eof;
|
|
};
|
|
|
|
static inline void io__init(struct io *io, int fd,
|
|
char *buf, unsigned int buf_len)
|
|
{
|
|
io->fd = fd;
|
|
io->buf_len = buf_len;
|
|
io->buf = buf;
|
|
io->end = buf;
|
|
io->data = buf;
|
|
io->eof = false;
|
|
}
|
|
|
|
/* Reads one character from the "io" file with similar semantics to fgetc. */
|
|
static inline int io__get_char(struct io *io)
|
|
{
|
|
char *ptr = io->data;
|
|
|
|
if (io->eof)
|
|
return -1;
|
|
|
|
if (ptr == io->end) {
|
|
ssize_t n = read(io->fd, io->buf, io->buf_len);
|
|
|
|
if (n <= 0) {
|
|
io->eof = true;
|
|
return -1;
|
|
}
|
|
ptr = &io->buf[0];
|
|
io->end = &io->buf[n];
|
|
}
|
|
io->data = ptr + 1;
|
|
return *ptr;
|
|
}
|
|
|
|
/* Read a hexadecimal value with no 0x prefix into the out argument hex. If the
|
|
* first character isn't hexadecimal returns -2, io->eof returns -1, otherwise
|
|
* returns the character after the hexadecimal value which may be -1 for eof.
|
|
* If the read value is larger than a u64 the high-order bits will be dropped.
|
|
*/
|
|
static inline int io__get_hex(struct io *io, __u64 *hex)
|
|
{
|
|
bool first_read = true;
|
|
|
|
*hex = 0;
|
|
while (true) {
|
|
int ch = io__get_char(io);
|
|
|
|
if (ch < 0)
|
|
return ch;
|
|
if (ch >= '0' && ch <= '9')
|
|
*hex = (*hex << 4) | (ch - '0');
|
|
else if (ch >= 'a' && ch <= 'f')
|
|
*hex = (*hex << 4) | (ch - 'a' + 10);
|
|
else if (ch >= 'A' && ch <= 'F')
|
|
*hex = (*hex << 4) | (ch - 'A' + 10);
|
|
else if (first_read)
|
|
return -2;
|
|
else
|
|
return ch;
|
|
first_read = false;
|
|
}
|
|
}
|
|
|
|
/* Read a positive decimal value with out argument dec. If the first character
|
|
* isn't a decimal returns -2, io->eof returns -1, otherwise returns the
|
|
* character after the decimal value which may be -1 for eof. If the read value
|
|
* is larger than a u64 the high-order bits will be dropped.
|
|
*/
|
|
static inline int io__get_dec(struct io *io, __u64 *dec)
|
|
{
|
|
bool first_read = true;
|
|
|
|
*dec = 0;
|
|
while (true) {
|
|
int ch = io__get_char(io);
|
|
|
|
if (ch < 0)
|
|
return ch;
|
|
if (ch >= '0' && ch <= '9')
|
|
*dec = (*dec * 10) + ch - '0';
|
|
else if (first_read)
|
|
return -2;
|
|
else
|
|
return ch;
|
|
first_read = false;
|
|
}
|
|
}
|
|
|
|
#endif /* __API_IO__ */
|