From: Simon Glass <sjg@chromium.org> Provide a version of fgets() which works on file descriptors. This can be used to read lines from a file, as will be needed for the ulib test-program. Signed-off-by: Simon Glass <sjg@chromium.org> --- arch/sandbox/cpu/os.c | 32 ++++++++++++++++++++++++++++++++ include/os.h | 14 ++++++++++++++ 2 files changed, 46 insertions(+) diff --git a/arch/sandbox/cpu/os.c b/arch/sandbox/cpu/os.c index 1c4e23cb4eb..891dfd9c9b8 100644 --- a/arch/sandbox/cpu/os.c +++ b/arch/sandbox/cpu/os.c @@ -150,6 +150,38 @@ int os_unlink(const char *pathname) return unlink(pathname); } +char *os_fgets(char *str, int size, int fd) +{ + char *s = str; + int n = size - 1; + int i; + + if (n <= 0 || !str) + return NULL; + + for (i = 0; i < n; i++) { + ssize_t ret; + char c; + + ret = read(fd, &c, 1); + if (ret <= 0) { + /* EOF or error */ + if (!i) + return NULL; + break; + } + + *s++ = c; + + if (c == '\n') + break; + } + + *s = '\0'; + + return str; +} + void os_exit(int exit_code) { exit(exit_code); diff --git a/include/os.h b/include/os.h index 3393acb435a..e5c524c57a4 100644 --- a/include/os.h +++ b/include/os.h @@ -106,6 +106,20 @@ int os_isatty(int fd); */ int os_unlink(const char *pathname); +/** + * os_fgets() - read a string from a file stream + * + * Reads at most @size - 1 characters from the stream and stores them in str. + * Reading stops after an EOF or a newline. If a newline is read, it is + * stored in str. A terminating nul byte is appended. + * + * @str: Buffer to store the string + * @size: Maximum number of characters to read (including null terminator) + * @fd: File descriptor to read from + * Return: str on success, NULL on error, or EOF with no characters read + */ +char *os_fgets(char *str, int size, int fd); + /** os_persistent_fname() - Find the path to a test file * * @buf: Buffer to hold path -- 2.43.0