Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
tools/nolibc: Add fread() to stdio.h
Add a very basic version of fread() like we already have for fwrite().
Signed-off-by: Daniel Palmer <daniel@thingy.jp>
Link: https://patch.msgid.link/20260105023629.1502801-2-daniel@thingy.jp
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
authored by
Daniel Palmer
and committed by
Thomas Weißschuh
edaf3074
6fe8360b
+33
-1
+33
-1
tools/include/nolibc/stdio.h
+33
-1
tools/include/nolibc/stdio.h
···
170
170
}
171
171
172
172
173
-
/* fwrite(), puts(), fputs(). Note that puts() emits '\n' but not fputs(). */
173
+
/* fwrite(), fread(), puts(), fputs(). Note that puts() emits '\n' but not fputs(). */
174
174
175
175
/* internal fwrite()-like function which only takes a size and returns 0 on
176
176
* success or EOF on error. It automatically retries on short writes.
···
202
202
s += size;
203
203
}
204
204
return written;
205
+
}
206
+
207
+
/* internal fread()-like function which only takes a size and returns 0 on
208
+
* success or EOF on error. It automatically retries on short reads.
209
+
*/
210
+
static __attribute__((unused))
211
+
int _fread(void *buf, size_t size, FILE *stream)
212
+
{
213
+
int fd = fileno(stream);
214
+
ssize_t ret;
215
+
216
+
while (size) {
217
+
ret = read(fd, buf, size);
218
+
if (ret <= 0)
219
+
return EOF;
220
+
size -= ret;
221
+
buf += ret;
222
+
}
223
+
return 0;
224
+
}
225
+
226
+
static __attribute__((unused))
227
+
size_t fread(void *s, size_t size, size_t nmemb, FILE *stream)
228
+
{
229
+
size_t nread;
230
+
231
+
for (nread = 0; nread < nmemb; nread++) {
232
+
if (_fread(s, size, stream) != 0)
233
+
break;
234
+
s += size;
235
+
}
236
+
return nread;
205
237
}
206
238
207
239
static __attribute__((unused))