+/*
+ * Check stored version, and return 1 if out-of-date or non-existent.
+ * Because the output of "mhparam version" is prefixed with "nmh-",
+ * use that prefix here.
+ */
+int
+nmh_version_changed (int older) {
+ const char *const context_version = context_find("Version");
+
+ if (older) {
+ /* Convert the version strings to floats and compare them. This will
+ break for versions with multiple decimal points, etc. */
+ const float current_version = strtof (VERSION, NULL);
+ const float old_version =
+ context_version && has_prefix(context_version, "nmh-")
+ ? strtof (context_version + 4, NULL)
+ : 99999999;
+
+ if (context_version == NULL || old_version < current_version) {
+ context_replace ("Version", "nmh-" VERSION);
+ }
+
+ return old_version < current_version;
+ }
+
+ if (context_version == NULL || strcmp(context_version, "nmh-" VERSION) != 0) {
+ context_replace ("Version", "nmh-" VERSION);
+ return 1;
+ }
+
+ return 0;
+}
+
+
+/* contains8bit returns true if any byte from start onwards fails
+ * isascii(3), i.e. is outside [0, 0x7f]. If start is NULL it returns
+ * false. Bytes are examined until a NUL byte, or, if end is not NULL,
+ * whilst start is before end. */
+bool contains8bit(const char *start, const char *end)
+{
+ const char *p;
+ char c;
+
+ if (!start)
+ return false;
+
+ p = start;
+ if (end) {
+ while (p < end && (c = (*p++)))
+ if (!isascii((unsigned char)c))
+ return true;
+ } else {
+ while ((c = (*p++)))
+ if (!isascii((unsigned char)c))
+ return true;
+ }
+
+ return false;
+}
+
+
+/*
+ * See if input has any 8-bit bytes.
+ */
+int
+scan_input (int fd, int *eightbit) {
+ int state;
+ char buf[BUFSIZ];
+
+ *eightbit = 0;
+ lseek(fd, 0, SEEK_SET);
+
+ while ((state = read (fd, buf, sizeof buf)) > 0) {
+ if (contains8bit (buf, buf + state)) {
+ *eightbit = 1;
+ return OK;
+ }
+ }
+
+ return state == NOTOK ? NOTOK : OK;
+}
+
+
+/*
+ * Convert an int to a char string.
+ */
projects / nmh / blobdiff