diff options
| author | Neels Hofmeyr <neels@hofmeyr.de> | 2019-04-11 07:16:02 +0200 |
|---|---|---|
| committer | Neels Hofmeyr <neels@hofmeyr.de> | 2019-04-11 07:40:25 +0200 |
| commit | 8531d6695f7363e5fa24141c53253e699d99ca0a (patch) | |
| tree | 0c89e7ee2c6dc6767ca512ec6537579fd1c9df22 /include/osmocom/core | |
| parent | d79ccc65f7134839a6d00f0eb70f43c2b614e9c8 (diff) | |
tweak OSMO_STRBUF_APPEND(), add OSMO_STRBUF_APPEND_NOLEN()
In OSMO_STRBUF_APPEND, use local variable names that are less likely to shadow
other local variables: prefix with _sb_.
In OSMO_STRBUF_APPEND, add a check to add to .pos only if it is not NULL.
Add OSMO_STRBUF_APPEND_NOLEN(), which works for function signatures that don't
return a length. This is useful for any osmo_*_buf() string writing functions,
so that these write directly to the strbuf.
Change-Id: I108cadf72deb3a3bcab9a07e50572d9da1ab0359
Diffstat (limited to 'include/osmocom/core')
| -rw-r--r-- | include/osmocom/core/utils.h | 37 |
1 files changed, 30 insertions, 7 deletions
diff --git a/include/osmocom/core/utils.h b/include/osmocom/core/utils.h index 474e36c4..f13c1e48 100644 --- a/include/osmocom/core/utils.h +++ b/include/osmocom/core/utils.h @@ -205,14 +205,14 @@ struct osmo_strbuf { #define OSMO_STRBUF_APPEND(STRBUF, func, args...) do { \ if (!(STRBUF).pos) \ (STRBUF).pos = (STRBUF).buf; \ - size_t remain = (STRBUF).buf ? (STRBUF).len - ((STRBUF).pos - (STRBUF).buf) : 0; \ - int l = func((STRBUF).pos, remain, ##args); \ - if (l < 0 || l > remain) \ + size_t _sb_remain = (STRBUF).buf ? (STRBUF).len - ((STRBUF).pos - (STRBUF).buf) : 0; \ + int _sb_l = func((STRBUF).pos, _sb_remain, ##args); \ + if (_sb_l < 0 || _sb_l > _sb_remain) \ (STRBUF).pos = (STRBUF).buf + (STRBUF).len; \ - else \ - (STRBUF).pos += l; \ - if (l > 0) \ - (STRBUF).chars_needed += l; \ + else if ((STRBUF).pos) \ + (STRBUF).pos += _sb_l; \ + if (_sb_l > 0) \ + (STRBUF).chars_needed += _sb_l; \ } while(0) /*! Shortcut for OSMO_STRBUF_APPEND() invocation using snprintf(). @@ -237,6 +237,29 @@ struct osmo_strbuf { #define OSMO_STRBUF_PRINTF(STRBUF, fmt, args...) \ OSMO_STRBUF_APPEND(STRBUF, snprintf, fmt, ##args) +/*! Like OSMO_STRBUF_APPEND(), but for function signatures that return the char* buffer instead of a length. + * When using this function, the final STRBUF.chars_needed may not reflect the actual number of characters needed, since + * that number cannot be obtained from this kind of function signature. + * \param[inout] STRBUF A struct osmo_strbuf instance. + * \param[in] func A function with a signature of char *func(char *dst, size_t dst_len [, args]) where + * the returned string is always written to dst. + * \param[in] args Arguments passed to func, if any. + */ +#define OSMO_STRBUF_APPEND_NOLEN(STRBUF, func, args...) do { \ + if (!(STRBUF).pos) \ + (STRBUF).pos = (STRBUF).buf; \ + size_t _sb_remain = (STRBUF).buf ? (STRBUF).len - ((STRBUF).pos - (STRBUF).buf) : 0; \ + if (_sb_remain) { \ + func((STRBUF).pos, _sb_remain, ##args); \ + } \ + size_t _sb_l = (STRBUF).pos ? strnlen((STRBUF).pos, _sb_remain) : 0; \ + if (_sb_l > _sb_remain) \ + (STRBUF).pos = (STRBUF).buf + (STRBUF).len; \ + else if ((STRBUF).pos) \ + (STRBUF).pos += _sb_l; \ + (STRBUF).chars_needed += _sb_l; \ + } while(0) + bool osmo_str_startswith(const char *str, const char *startswith_str); /*! @} */ |