+
+
+/*
+ * Finds first occurrence of str in buf. buf is not a C string but a
+ * byte array of length buflen. str is a null-terminated C string.
+ * find_str() does not modify buf but passes back a non-const char *
+ * pointer so that the caller can modify it.
+ */
+char *
+find_str (const char buf[], size_t buflen, const char *str) {
+ const size_t len = strlen (str);
+ size_t i;
+
+ for (i = 0; i + len <= buflen; ++i, ++buf) {
+ if (! memcmp (buf, str, len)) return (char *) buf;
+ }
+
+ return NULL;
+}
+
+
+/*
+ * Finds last occurrence of str in buf. buf is not a C string but a
+ * byte array of length buflen. str is a null-terminated C string.
+ * find_str() does not modify buf but passes back a non-const char *
+ * pointer so that the caller can modify it.
+ */
+char *
+rfind_str (const char buf[], size_t buflen, const char *str) {
+ const size_t len = strlen (str);
+ size_t i;
+
+ for (i = 0, buf += buflen - len; i + len <= buflen; ++i, --buf) {
+ if (! memcmp (buf, str, len)) return (char *) buf;
+ }
+
+ return NULL;
+}
+
+
+/* POSIX doesn't have strcasestr() so emulate it. */
+char *
+nmh_strcasestr (const char *s1, const char *s2) {
+ const size_t len = strlen (s2);
+
+ if (isupper ((unsigned char) s2[0]) || islower ((unsigned char)s2[0])) {
+ char first[3];
+ first[0] = (char) toupper ((unsigned char) s2[0]);
+ first[1] = (char) tolower ((unsigned char) s2[0]);
+ first[2] = '\0';
+
+ for (s1 = strpbrk (s1, first); s1; s1 = strpbrk (++s1, first)) {
+ if (! strncasecmp (s1, s2, len)) return (char *) s1;
+ }
+ } else {
+ for (s1 = strchr (s1, s2[0]); s1; s1 = strchr (++s1, s2[0])) {
+ if (! strncasecmp (s1, s2, len)) return (char *) s1;
+ }
+ }
+
+ return NULL;
+}
+
+
+/* EndsWithC returns true if non-NULL string s ends with a c before the
+ * terminating NUL. */
+bool EndsWithC(char *s, int c)
+{
+ return *s && s[strlen(s) - 1] == c;
+}
+
+
+/* TrimSuffixC deletes c from the end of non-NULL string s if it's
+ * present, shortening s by 1. Only one instance of c is removed. */
+void TrimSuffixC(char *s, int c)
+{
+ if (!*s)
+ return;
+
+ s += strlen(s) - 1;
+ if (*s == c)
+ *s = '\0';
+}
+
+
+int
+nmh_init(const char *argv0, int read_context) {
+ int status = OK;
+ char *locale;
+
+ invo_name = r1bindex ((char *) argv0, '/');
+
+ if (setup_signal_handlers()) {
+ admonish("sigaction", "unable to set up signal handlers");
+ }
+
+ /* POSIX atexit() does not define any error conditions. */
+ if (atexit(remove_registered_files_atexit)) {
+ admonish("atexit", "unable to register atexit function");
+ }
+
+ /* Read context, if supposed to. */
+ if (read_context) {
+ int allow_version_check = 1;
+ int check_older_version = 0;
+ char *cp;
+
+ context_read();
+
+ if (read_context != 1 ||
+ ((cp = context_find ("Welcome")) && strcasecmp (cp, "disable") == 0)) {
+ allow_version_check = 0;
+ } else if ((cp = getenv ("MHCONTEXT")) != NULL && *cp != '\0') {
+ /* Context file comes from $MHCONTEXT, so only print the message
+ if the context file has an older version. If it does, or if it
+ doesn't have a version at all, update the version. */
+ check_older_version = 1;
+ }
+
+ /* Check to see if the user is running a different (or older, if
+ specified) version of nmh than they had run bfore, and notify them
+ if so. But only if read_context was set to a value to enable. */
+ if (allow_version_check && isatty (fileno (stdin)) &&
+ isatty (fileno (stdout)) && isatty (fileno (stderr))) {
+ if (nmh_version_changed (check_older_version)) {
+ printf ("==================================================="
+ "=====================\n");
+ printf ("Welcome to nmh version %s\n\n", VERSION);
+ printf ("See the release notes in %s/NEWS\n\n",
+ mhdocdir);
+ print_intro (stdout, 1);
+ printf ("\nThis message will not be repeated until "
+ "nmh is next updated.\n");
+ printf ("==================================================="
+ "=====================\n\n");
+
+ fputs ("Press enter to continue: ", stdout);
+ (void) read_line ();
+ putchar ('\n');
+ }
+ }
+ } else {
+ if ((status = context_foil(NULL)) != OK) {
+ advise("", "failed to create minimal profile/context");
+ }
+ }
+
+ /* Allow the user to set a locale in their profile. Otherwise, use the
+ "" string to pull it from their environment, see setlocale(3). */
+ if ((locale = context_find ("locale")) == NULL) {
+ locale = "";
+ }
+
+ if (! setlocale (LC_ALL, locale)) {
+ admonish (NULL, "setlocale failed, check your LC_ALL, LC_CTYPE, and "
+ "LANG environment variables");
+ }
+
+ return status;
+}
+
+
+/*
+ * 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 && strncmp (context_version, "nmh-", 4) == 0
+ ? strtof (context_version + 4, NULL)
+ : 99999999;
+
+ if (context_version == NULL || old_version < current_version) {
+ context_replace ("Version", "nmh-" VERSION);
+ }
+
+ return old_version < current_version ? 1 : 0;
+ }
+
+ if (context_version == NULL || strcmp(context_version, "nmh-" VERSION) != 0) {
+ context_replace ("Version", "nmh-" VERSION);
+ return 1;
+ }
+
+ return 0;
+}
+
+
+/* Returns copy of argument str with all characters converted to upper
+ case, and trimmed whitespace (see cpytrim()) . */
+char *
+upcase (const char *str) {
+ char *up = cpytrim (str);
+ char *cp;
+
+ for (cp = up; *cp; ++cp) { *cp = toupper ((unsigned char) *cp); }
+
+ return up;
+}
+
+
+/*
+ * Scan for any 8-bit characters. Return 1 if they exist.
+ *
+ * Scan up until the given endpoint (but not the actual endpoint itself).
+ * If the endpoint is NULL, scan until a '\0' is reached.
+ */
+
+int
+contains8bit(const char *start, const char *end)
+{
+ if (! start)
+ return 0;
+
+ while (*start != '\0' && (!end || (start < end)))
+ if (! isascii((unsigned char) *start++))
+ return 1;
+
+ return 0;
+}
+
+
+/*
+ * See if input has any 8-bit bytes.
+ */
+int
+scan_input (int fd, int *eightbit) {
+ int state;
+ char buf[BUFSIZ];
+
+ *eightbit = 0;
+ lseek (fd, (off_t) 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;
+}
projects / nmh / blobdiff