+ /* Copy POSIX behaviour, coping with non-POSIX systems. */
+ if (size == 0) {
+ free(ptr);
+ return mh_xmalloc(1); /* Get a unique pointer. */
+ }
+ if (!ptr)
+ return mh_xmalloc(size);
+
+ new = realloc(ptr, size);
+ if (!new)
+ die("realloc failed, size wanted: %zu", size);
+
+ return new;
+}
+
+/* Call calloc(3), exiting on NULL return. */
+void *
+mh_xcalloc(size_t nelem, size_t elsize)
+{
+ void *p;
+
+ if (!nelem || !elsize)
+ return mh_xmalloc(1); /* Get a unique pointer. */
+
+ p = calloc(nelem, elsize);
+ if (!p)
+ die("calloc failed, size wanted: %zu * %zu", nelem, elsize);
+
+ return p;
+}
+
+/* Duplicate a NUL-terminated string, exit on failure. */
+char *
+mh_xstrdup(const char *src)
+{
+ size_t n;
+ char *dest;
+
+ n = strlen(src) + 1; /* Ignore possibility of overflow. */
+ dest = mh_xmalloc(n);
+ memcpy(dest, src, n);
+
+ return dest;
+}
+
+/*
+ * Return the present working directory, if the current directory does not
+ * exist, or is too long, make / the pwd.
+ */
+char *
+pwd(void)
+{
+ char *cp;
+ static char curwd[PATH_MAX];
+
+ if (!getcwd (curwd, PATH_MAX)) {
+ inform("unable to determine working directory, continuing...");
+ if (!mypath || !*mypath
+ || (strcpy (curwd, mypath), chdir (curwd)) == -1) {
+ strcpy (curwd, "/");
+ if (chdir (curwd) < 0) {
+ advise (curwd, "chdir");
+ }
+ }
+ return curwd;
+ }
+
+ if ((cp = curwd + strlen (curwd) - 1) > curwd && *cp == '/')
+ *cp = '\0';
+
+ return curwd;
+}
+
+/* add returns a newly malloc'd string, exiting on failure. The order
+ * of the parameters is unusual. A NULL parameter is treated as an
+ * empty string. s1 is free'd. Use mh_xstrdup(s) rather than add(s,
+ * NULL), with FENDNULL() if s might be NULL.
+ *
+ * add(NULL, NULL) -> ""
+ * add(NULL, "foo") -> "foo"
+ * add("bar", NULL) -> "bar"
+ * add("bar", "foo") -> "foobar"
+ */
+char *
+add (const char *s2, char *s1)
+{
+ char *cp;
+ size_t len1 = 0, len2 = 0;
+
+ if (s1)
+ len1 = strlen (s1);
+ if (s2)
+ len2 = strlen (s2);
+
+ cp = mh_xmalloc (len1 + len2 + 1);
+
+ /* Copy s1 and free it */
+ if (s1) {
+ memcpy (cp, s1, len1);
+ free (s1);
+ }
+
+ /* Copy s2 */
+ if (s2)
+ memcpy (cp + len1, s2, len2);
+
+ /* Now NULL terminate the string */
+ cp[len1 + len2] = '\0';
+
+ return cp;
+}
+
+/*
+ * addlist
+ * Append an item to a comma separated list
+ */
+char *
+addlist (char *list, const char *item)
+{
+ if (list)
+ list = add (", ", list);
+
+ return add (item, list);
+}
+
+/*
+ * folder_exists
+ * Check to see if a folder exists.
+ */
+int
+folder_exists(const char *folder)
+{
+ struct stat st;
+
+ return stat(folder, &st) != -1;
+}
+
+/*
+ * create_folder
+ * Check to see if a folder exists, if not, prompt the user to create
+ * it.
+ */
+void
+create_folder(char *folder, int autocreate, void (*done_callback)(int))
+{
+ struct stat st;
+ extern int errno;
+ char *cp;
+
+ if (stat (folder, &st) == -1) {
+ if (errno != ENOENT)
+ adios (folder, "error on folder");
+ if (autocreate == 0) {
+ /* ask before creating folder */
+ cp = concat ("Create folder \"", folder, "\"? ", NULL);
+ if (!read_yes_or_no_if_tty (cp))
+ done_callback (1);
+ free (cp);
+ } else if (autocreate == -1) {
+ /* do not create, so exit */
+ done_callback (1);
+ }
+ if (!makedir (folder))
+ die("unable to create folder %s", folder);
+ }
+}
+
+/*
+ * num_digits
+ * Return the number of digits in a nonnegative integer.
+ */
+int
+num_digits (int n)
+{
+ int ndigits = 0;
+
+ /* Sanity check */
+ if (n < 0)
+ die("oops, num_digits called with negative value");
+
+ if (n == 0)
+ return 1;
+
+ while (n) {
+ n /= 10;
+ ndigits++;
+ }
+
+ return ndigits;
+}
+
+/*
+ * Append a message arg to an array of them, resizing it if necessary.
+ * Really a simple vector-of-(char *) maintenance routine.
+ */
+void
+app_msgarg(struct msgs_array *msgs, char *cp)
+{
+ if(msgs->size >= msgs->max) {
+ msgs->max += MAXMSGS;
+ msgs->msgs = mh_xrealloc(msgs->msgs,
+ msgs->max * sizeof(*msgs->msgs));
+ }
+ msgs->msgs[msgs->size++] = cp;
+}
+
+/*
+ * Append a message number to an array of them, resizing it if necessary.
+ * Like app_msgarg, but with a vector-of-ints instead.
+ */
+
+void
+app_msgnum(struct msgnum_array *msgs, int msgnum)
+{
+ if (msgs->size >= msgs->max) {
+ msgs->max += MAXMSGS;
+ msgs->msgnums = mh_xrealloc(msgs->msgnums,
+ msgs->max * sizeof(*msgs->msgnums));
+ }
+ msgs->msgnums[msgs->size++] = msgnum;
+}
+
+
+/*
+ * 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;
+}
+
+
+/* truncpy copies at most size - 1 chars from non-NULL src to non-NULL,
+ * non-overlapping, dst, and ensures dst is NUL terminated. If size is
+ * zero then it aborts as dst cannot be NUL terminated.
+ *
+ * It's to be used when truncation is intended and correct, e.g.
+ * reporting a possibly very long external string back to the user. One
+ * of its advantages over strncpy(3) is it doesn't pad in the common
+ * case of no truncation. */
+void
+trunccpy(char *dst, const char *src, size_t size)
+{
+ if (!size) {
+ inform("trunccpy: zero-length destination: \"%.20s\"",
+ src ? src : "null");
+ abort();
+ }
+
+ if (strnlen(src, size) < size) {
+ strcpy(dst, src);
+ } else {
+ memcpy(dst, src, size - 1);
+ dst[size - 1] = '\0';
+ }
+}
+
+
+/* has_prefix returns true if non-NULL s starts with non-NULL prefix. */
+bool
+has_prefix(const char *s, const char *prefix)
+{
+ while (*s && *s == *prefix) {
+ s++;
+ prefix++;
+ }
+
+ return *prefix == '\0';
+}
+
+
+/* has_suffix returns true if non-NULL s ends with non-NULL suffix. */
+bool
+has_suffix(const char *s, const char *suffix)
+{
+ size_t ls, lsuf;
+
+ ls = strlen(s);
+ lsuf = strlen(suffix);
+
+ return lsuf <= ls && !strcmp(s + ls - lsuf, suffix);
+}
+
+
+/* has_suffix_c returns true if non-NULL string s ends with a c before the
+ * terminating NUL. */
+bool
+has_suffix_c(const char *s, int c)
+{
+ return *s && s[strlen(s) - 1] == c;
+}
+
+
+/* trim_suffix_c 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
+trim_suffix_c(char *s, int c)
+{
+ if (!*s)
+ return;
+
+ s += strlen(s) - 1;
+ if (*s == c)
+ *s = '\0';
+}
+
+
+/* to_lower runs all of s through tolower(3). */
+void
+to_lower(char *s)
+{
+ unsigned char *b;
+
+ for (b = (unsigned char *)s; (*b = tolower(*b)); b++)
+ ;
+}
+
+
+/* to_upper runs all of s through toupper(3). */
+void
+to_upper(char *s)
+{
+ unsigned char *b;
+
+ for (b = (unsigned char *)s; (*b = toupper(*b)); b++)
+ ;
+}
+
+
+int
+nmh_init(const char *argv0, bool read_context, bool check_version)
+{
+ int status = OK;
+ char *locale;
+
+ invo_name = r1bindex ((char *) argv0, '/');
+
+ if (setup_signal_handlers()) {
+ admonish("sigaction", "unable to set up signal handlers");
+ }
projects / nmh / blobdiff