diff options
Diffstat (limited to 'libbb')
| -rw-r--r-- | libbb/lineedit.c | 45 | ||||
| -rw-r--r-- | libbb/read_key.c | 21 |
2 files changed, 40 insertions, 26 deletions
diff --git a/libbb/lineedit.c b/libbb/lineedit.c index 8e339da53..7c0eef90d 100644 --- a/libbb/lineedit.c +++ b/libbb/lineedit.c @@ -1658,27 +1658,28 @@ static void win_changed(int nsig) static int lineedit_read_key(char *read_key_buffer) { int64_t ic; - struct pollfd pfd; - int delay = -1; + int timeout = -1; #if ENABLE_FEATURE_ASSUME_UNICODE char unicode_buf[MB_CUR_MAX + 1]; int unicode_idx = 0; #endif - pfd.fd = STDIN_FILENO; - pfd.events = POLLIN; - do { -#if ENABLE_FEATURE_EDITING_ASK_TERMINAL || ENABLE_FEATURE_ASSUME_UNICODE - poll_again: + while (1) { + /* Wait for input. TIMEOUT = -1 makes read_key wait even + * on nonblocking stdin, TIMEOUT = 50 makes sure we won't + * insist on full MB_CUR_MAX buffer to declare input like + * "\xff\n",pause,"ls\n" invalid and thus won't lose "ls". + * + * Note: read_key sets errno to 0 on success. + */ + ic = read_key(STDIN_FILENO, read_key_buffer, timeout); + if (errno) { +#if ENABLE_FEATURE_ASSUME_UNICODE + if (errno == EAGAIN && unicode_idx != 0) + goto pushback; #endif - if (read_key_buffer[0] == 0) { - /* Wait for input. Can't just call read_key, - * it returns at once if stdin - * is in non-blocking mode. */ - safe_poll(&pfd, 1, delay); + break; } - /* Note: read_key sets errno to 0 on success: */ - ic = read_key(STDIN_FILENO, read_key_buffer); #if ENABLE_FEATURE_EDITING_ASK_TERMINAL if ((int32_t)ic == KEYCODE_CURSOR_POS @@ -1695,7 +1696,7 @@ static int lineedit_read_key(char *read_key_buffer) } } } - goto poll_again; + continue; } #endif @@ -1704,19 +1705,20 @@ static int lineedit_read_key(char *read_key_buffer) wchar_t wc; if ((int32_t)ic < 0) /* KEYCODE_xxx */ - return ic; - // TODO: imagine sequence like: 0xff, <left-arrow>: we are currently losing 0xff... + break; + // TODO: imagine sequence like: 0xff,<left-arrow>: we are currently losing 0xff... unicode_buf[unicode_idx++] = ic; unicode_buf[unicode_idx] = '\0'; if (mbstowcs(&wc, unicode_buf, 1) != 1) { /* Not (yet?) a valid unicode char */ if (unicode_idx < MB_CUR_MAX) { - delay = 50; - goto poll_again; + timeout = 50; + continue; } + pushback: /* Invalid sequence. Save all "bad bytes" except first */ - read_key_ungets(read_key_buffer, unicode_buf + 1, MB_CUR_MAX - 1); + read_key_ungets(read_key_buffer, unicode_buf + 1, unicode_idx - 1); /* * ic = unicode_buf[0] sounds even better, but currently * this does not work: wchar_t[] -> char[] conversion @@ -1730,7 +1732,8 @@ static int lineedit_read_key(char *read_key_buffer) } } #endif - } while (errno == EAGAIN); + break; + } return ic; } diff --git a/libbb/read_key.c b/libbb/read_key.c index 98b3131de..0faa12c97 100644 --- a/libbb/read_key.c +++ b/libbb/read_key.c @@ -9,7 +9,7 @@ */ #include "libbb.h" -int64_t FAST_FUNC read_key(int fd, char *buffer) +int64_t FAST_FUNC read_key(int fd, char *buffer, int timeout) { struct pollfd pfd; const char *seq; @@ -90,14 +90,27 @@ int64_t FAST_FUNC read_key(int fd, char *buffer) /* ESC [ Z - Shift-Tab */ }; + pfd.fd = fd; + pfd.events = POLLIN; + buffer++; /* saved chars counter is in buffer[-1] now */ start_over: errno = 0; n = (unsigned char)buffer[-1]; if (n == 0) { - /* If no data, block waiting for input. - * It is tempting to read more than one byte here, + /* If no data, wait for input. + * If requested, wait TIMEOUT ms. TIMEOUT = -1 is useful + * if fd can be in non-blocking mode. + */ + if (timeout >= -1) { + if (safe_poll(&pfd, 1, timeout) == 0) { + /* Timed out */ + errno = EAGAIN; + return -1; + } + } + /* It is tempting to read more than one byte here, * but it breaks pasting. Example: at shell prompt, * user presses "c","a","t" and then pastes "\nline\n". * When we were reading 3 bytes here, we were eating @@ -121,8 +134,6 @@ int64_t FAST_FUNC read_key(int fd, char *buffer) } /* Loop through known ESC sequences */ - pfd.fd = fd; - pfd.events = POLLIN; seq = esccmds; while (*seq != '\0') { /* n - position in sequence we did not read yet */ |