+ if (!line_handler || mode == LINE_MODE_RO)
+ return num_lines;
+ i = buf + size - start;
+ if (i && i != size)
+ memmove(buf, start, i);
+ return i;
+}
+
+/**
+ * Call a custom function for each complete line.
+ *
+ * \param buf The buffer containing data separated by newlines.
+ * \param size The number of bytes in \a buf.
+ * \param line_handler The custom function.
+ * \param private_data Pointer passed to \a line_handler.
+ *
+ * If \p line_handler is \p NULL, the function returns the number of complete
+ * lines in \p buf. Otherwise, \p line_handler is called for each complete
+ * line in \p buf. The first argument to \p line_handler is the current line,
+ * and \p private_data is passed as the second argument. The function returns
+ * if \p line_handler returns a negative value or no more lines are in the
+ * buffer. The rest of the buffer (last chunk containing an incomplete line)
+ * is moved to the beginning of the buffer.
+ *
+ * \return If \p line_handler is not \p NULL, this function returns the number
+ * of bytes not handled to \p line_handler on success, or the negative return
+ * value of the \p line_handler on errors.
+ *
+ * \sa for_each_line_ro().
+ */
+int for_each_line(char *buf, size_t size, line_handler_t *line_handler,
+ void *private_data)
+{
+ return for_each_complete_line(LINE_MODE_RW, buf, size, line_handler,
+ private_data);
+}
+
+/**
+ * Call a custom function for each complete line.
+ *
+ * \param buf Same meaning as in \p for_each_line().
+ * \param size Same meaning as in \p for_each_line().
+ * \param line_handler Same meaning as in \p for_each_line().
+ * \param private_data Same meaning as in \p for_each_line().
+ *
+ * This function behaves like \p for_each_line(), but \a buf is left unchanged.
+ *
+ * \return On success, the function returns the number of complete lines in \p
+ * buf, otherwise the (negative) return value of \p line_handler is returned.
+ *
+ * \sa for_each_line().
+ */
+int for_each_line_ro(char *buf, size_t size, line_handler_t *line_handler,
+ void *private_data)
+{
+ return for_each_complete_line(LINE_MODE_RO, buf, size, line_handler,
+ private_data);
+}
+
+/** Return the hex characters of the lower 4 bits. */
+#define hex(a) (hexchar[(a) & 15])
+
+static void write_size_header(char *buf, int n)
+{
+ static char hexchar[] = "0123456789abcdef";
+
+ buf[0] = hex(n >> 12);
+ buf[1] = hex(n >> 8);
+ buf[2] = hex(n >> 4);
+ buf[3] = hex(n);
+ buf[4] = ' ';
+}
+
+/**
+ * Read a four-byte hex-number and return its value.
+ *
+ * Each status item sent by para_server is prefixed with such a hex number in
+ * ASCII which describes the size of the status item.
+ *
+ * \param buf The buffer which must be at least four bytes long.
+ *
+ * \return The value of the hex number on success, \p -E_SIZE_PREFIX if the
+ * buffer did not contain only hex digits.
+ */
+int read_size_header(const char *buf)
+{
+ int i, len = 0;
+
+ for (i = 0; i < 4; i++) {
+ unsigned char c = buf[i];
+ len <<= 4;
+ if (c >= '0' && c <= '9') {
+ len += c - '0';
+ continue;
+ }
+ if (c >= 'a' && c <= 'f') {
+ len += c - 'a' + 10;
+ continue;
+ }
+ return -E_SIZE_PREFIX;
+ }
+ if (buf[4] != ' ')
+ return -E_SIZE_PREFIX;
+ return len;
+}
+
+/**
+ * Safely print into a buffer at a given offset.
+ *
+ * \param b Determines the buffer, its size, and the offset.
+ * \param fmt The format string.
+ *
+ * This function prints into the buffer given by \a b at the offset which is
+ * also given by \a b. If there is not enough space to hold the result, the
+ * buffer size is doubled until the underlying call to vsnprintf() succeeds
+ * or the size of the buffer exceeds the maximal size specified in \a b.
+ *
+ * In the latter case the unmodified \a buf and \a offset values as well as the
+ * private_data pointer of \a b are passed to the \a max_size_handler of \a b.
+ * If this function succeeds, i.e. returns a non-negative value, the offset of
+ * \a b is reset to zero and the given data is written to the beginning of the
+ * buffer. If \a max_size_handler() returns a negative value, this value is
+ * returned by \a para_printf().
+ *
+ * Upon return, the offset of \a b is adjusted accordingly so that subsequent
+ * calls to this function append data to what is already contained in the
+ * buffer.
+ *
+ * It's OK to call this function with \p b->buf being \p NULL. In this case, an
+ * initial buffer is allocated.
+ *
+ * \return The number of bytes printed into the buffer (not including the
+ * terminating \p NULL byte) on success, negative on errors. If there is no
+ * size-bound on \a b, i.e. if \p b->max_size is zero, this function never
+ * fails.
+ *
+ * \sa make_message(), vsnprintf(3).
+ */
+__printf_2_3 int para_printf(struct para_buffer *b, const char *fmt, ...)
+{
+ int ret, sz_off = (b->flags & PBF_SIZE_PREFIX)? 5 : 0;
+
+ if (!b->buf) {
+ b->buf = para_malloc(128);
+ b->size = 128;
+ b->offset = 0;
+ }
+ while (1) {
+ char *p = b->buf + b->offset;
+ size_t size = b->size - b->offset;
+ va_list ap;
+
+ if (size > sz_off) {
+ va_start(ap, fmt);
+ ret = vsnprintf(p + sz_off, size - sz_off, fmt, ap);
+ va_end(ap);
+ if (ret > -1 && ret < size - sz_off) { /* success */
+ b->offset += ret + sz_off;
+ if (sz_off)
+ write_size_header(p, ret);
+ return ret + sz_off;
+ }
+ }
+ /* check if we may grow the buffer */
+ if (!b->max_size || 2 * b->size < b->max_size) { /* yes */
+ /* try again with more space */
+ b->size *= 2;
+ b->buf = para_realloc(b->buf, b->size);
+ continue;
+ }
+ /* can't grow buffer */
+ if (!b->offset || !b->max_size_handler) /* message too large */
+ return -ERRNO_TO_PARA_ERROR(ENOSPC);
+ ret = b->max_size_handler(b->buf, b->offset, b->private_data);
+ if (ret < 0)
+ return ret;
+ b->offset = 0;
+ }
+}
+
+/** \cond llong_minmax */
+/* LLONG_MAX and LLONG_MIN might not be defined. */
+#ifndef LLONG_MAX
+#define LLONG_MAX 9223372036854775807LL
+#endif
+#ifndef LLONG_MIN
+#define LLONG_MIN (-LLONG_MAX - 1LL)
+#endif
+/** \endcond llong_minmax */
+
+/**
+ * Convert a string to a 64-bit signed integer value.
+ *
+ * \param str The string to be converted.
+ * \param value Result pointer.
+ *
+ * \return Standard.
+ *
+ * \sa para_atoi32(), strtol(3), atoi(3).
+ */
+int para_atoi64(const char *str, int64_t *value)
+{
+ char *endptr;
+ long long tmp;
+
+ errno = 0; /* To distinguish success/failure after call */
+ tmp = strtoll(str, &endptr, 10);
+ if (errno == ERANGE && (tmp == LLONG_MAX || tmp == LLONG_MIN))
+ return -E_ATOI_OVERFLOW;
+ if (errno != 0 && tmp == 0) /* other error */
+ return -E_STRTOLL;
+ if (endptr == str)
+ return -E_ATOI_NO_DIGITS;
+ if (*endptr != '\0') /* Further characters after number */
+ return -E_ATOI_JUNK_AT_END;
+ *value = tmp;
+ return 1;
+}
+
+/**
+ * Convert a string to a 32-bit signed integer value.
+ *
+ * \param str The string to be converted.
+ * \param value Result pointer.
+ *
+ * \return Standard.
+ *
+ * \sa para_atoi64().
+*/
+int para_atoi32(const char *str, int32_t *value)
+{
+ int64_t tmp;
+ int ret;
+ const int32_t max = 2147483647;
+
+ ret = para_atoi64(str, &tmp);
+ if (ret < 0)
+ return ret;
+ if (tmp > max || tmp < -max - 1)
+ return -E_ATOI_OVERFLOW;
+ *value = tmp;
+ return 1;
+}
+
+static inline int loglevel_equal(const char *arg, const char * const ll)
+{
+ return !strncasecmp(arg, ll, strlen(ll));
+}
+
+/**
+ * Compute the loglevel number from its name.
+ *
+ * \param txt The name of the loglevel (debug, info, ...).
+ *
+ * \return The numeric representation of the loglevel name.
+ */
+int get_loglevel_by_name(const char *txt)
+{
+ if (loglevel_equal(txt, "debug"))
+ return LL_DEBUG;
+ if (loglevel_equal(txt, "info"))
+ return LL_INFO;
+ if (loglevel_equal(txt, "notice"))
+ return LL_NOTICE;
+ if (loglevel_equal(txt, "warning"))
+ return LL_WARNING;
+ if (loglevel_equal(txt, "error"))
+ return LL_ERROR;
+ if (loglevel_equal(txt, "crit"))
+ return LL_CRIT;
+ if (loglevel_equal(txt, "emerg"))
+ return LL_EMERG;
+ return -1;
+}
+
+static int get_next_word(const char *buf, const char *delim, char **word)
+{
+ enum line_state_flags {LSF_HAVE_WORD = 1, LSF_BACKSLASH = 2,
+ LSF_SINGLE_QUOTE = 4, LSF_DOUBLE_QUOTE = 8};
+ const char *in;
+ char *out;
+ int ret, state = 0;
+
+ out = para_malloc(strlen(buf) + 1);
+ *out = '\0';
+ *word = out;
+ for (in = buf; *in; in++) {
+ const char *p;
+
+ switch (*in) {
+ case '\\':
+ if (state & LSF_BACKSLASH) /* \\ */
+ goto copy_char;
+ state |= LSF_BACKSLASH;
+ state |= LSF_HAVE_WORD;
+ continue;
+ case 'n':
+ case 't':
+ if (state & LSF_BACKSLASH) { /* \n or \t */
+ *out++ = (*in == 'n')? '\n' : '\t';
+ state &= ~LSF_BACKSLASH;
+ continue;
+ }
+ goto copy_char;
+ case '"':
+ if (state & LSF_BACKSLASH) /* \" */
+ goto copy_char;
+ if (state & LSF_SINGLE_QUOTE) /* '" */
+ goto copy_char;
+ if (state & LSF_DOUBLE_QUOTE) {
+ state &= ~LSF_DOUBLE_QUOTE;
+ continue;
+ }
+ state |= LSF_HAVE_WORD;
+ state |= LSF_DOUBLE_QUOTE;
+ continue;
+ case '\'':
+ if (state & LSF_BACKSLASH) /* \' */
+ goto copy_char;
+ if (state & LSF_DOUBLE_QUOTE) /* "' */
+ goto copy_char;
+ if (state & LSF_SINGLE_QUOTE) {
+ state &= ~LSF_SINGLE_QUOTE;
+ continue;
+ }
+ state |= LSF_HAVE_WORD;
+ state |= LSF_SINGLE_QUOTE;
+ continue;
+ }
+ for (p = delim; *p; p++) {
+ if (*in != *p)
+ continue;
+ if (state & LSF_BACKSLASH)
+ goto copy_char;
+ if (state & LSF_SINGLE_QUOTE)
+ goto copy_char;
+ if (state & LSF_DOUBLE_QUOTE)
+ goto copy_char;
+ if (state & LSF_HAVE_WORD)
+ goto success;
+ break;
+ }
+ if (*p) /* ignore delimiter at the beginning */
+ continue;
+copy_char:
+ state |= LSF_HAVE_WORD;
+ *out++ = *in;
+ state &= ~LSF_BACKSLASH;
+ }
+ ret = 0;
+ if (!(state & LSF_HAVE_WORD))
+ goto out;
+ ret = -ERRNO_TO_PARA_ERROR(EINVAL);
+ if (state & LSF_BACKSLASH) {
+ PARA_ERROR_LOG("trailing backslash\n");
+ goto out;
+ }
+ if ((state & LSF_SINGLE_QUOTE) || (state & LSF_DOUBLE_QUOTE)) {
+ PARA_ERROR_LOG("unmatched quote character\n");
+ goto out;
+ }
+success:
+ *out = '\0';
+ return in - buf;