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syscall write: Should return number of bytes written

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Fixes bug where sometimes output truncates after a newline, or large
chunks of large output buffers are lost.
This commit is contained in:
Angus Gratton 2016-10-06 09:51:51 +11:00
parent 7bdcafe553
commit aae3e84829
1 changed files with 4 additions and 5 deletions
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9
components/esp32/syscalls.c
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@ -143,7 +143,7 @@ int _open_r(struct _reent *r, const char * path, int flags, int mode) {
}
ssize_t _write_r(struct _reent *r, int fd, const void * data, size_t size) {
const char* p = (const char*) data;
const char *data_c = (const char *)data;
if (fd == STDOUT_FILENO) {
static _lock_t stdout_lock; /* lazily initialised */
/* Even though newlib does stream locking on stdout, we need
@ -160,14 +160,13 @@ ssize_t _write_r(struct _reent *r, int fd, const void * data, size_t size) {
which aren't fully valid.)
*/
_lock_acquire_recursive(&stdout_lock);
while(size--) {
for (size_t i = 0; i < size; i++) {
#if CONFIG_NEWLIB_STDOUT_ADDCR
if (*p=='\n') {
if (data_c[i]=='\n') {
uart_tx_one_char('\r');
}
#endif
uart_tx_one_char(*p);
++p;
uart_tx_one_char(data_c[i]);
}
_lock_release_recursive(&stdout_lock);
}