/*
* utils.c -- various utility routines
*
- * $Id$
- *
* This code is Copyright (c) 2006, by the authors of nmh. See the
* COPYRIGHT file in the root directory of the nmh distribution for
* complete copyright information.
#include <h/mh.h>
#include <h/utils.h>
#include <stdlib.h>
+#include <fcntl.h>
#include <errno.h>
/*
+ * We allocate space for messages (msgs array)
+ * this number of elements at a time.
+ */
+#define MAXMSGS 256
+
+/*
* Safely call malloc
*/
void *
{
void *memory;
+ /* Some non-POSIX realloc()s don't cope with realloc(NULL,sz) */
+ if (!ptr)
+ return mh_xmalloc(size);
+
if (size == 0)
adios(NULL, "Tried to realloc 0bytes");
}
/*
+ * addlist
+ * Append an item to a comma separated list
+ */
+char *
+addlist (char *list, char *item)
+{
+ if (list)
+ list = add (", ", list);
+
+ return add (item, list);
+}
+
+/*
+ * folder_exists
+ * Check to see if a folder exists.
+ */
+int folder_exists(char *folder)
+{
+ struct stat st;
+ int exists = 0;
+
+ if (stat (folder, &st) == -1) {
+ /* The folder either doesn't exist, or we hit an error. Either way
+ * return a failure.
+ */
+ exists = 0;
+ } else {
+ /* We can see a folder with the right name */
+ exists = 1;
+ }
+
+ return exists;
+}
+
+
+/*
* 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)())
+void create_folder(char *folder, int autocreate, void (*done_callback)(int))
{
struct stat st;
extern int errno;
adios (NULL, "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)
+ adios (NULL, "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.
+ * The function is written to suit the arg parsing code it was extracted
+ * from, and will probably be changed when the other code is cleaned up.
+ */
+void
+app_msgarg(struct msgs_array *msgs, char *cp)
+{
+ if(msgs->size >= msgs->max)
+ msgs->msgs = mh_xrealloc(msgs->msgs, (msgs->max+=MAXMSGS)*sizeof(*msgs->msgs));
+ msgs->msgs[msgs->size++] = cp;
+}
+
+/* Open a form or components file */
+int
+open_form(char **form, char *def)
+{
+ int in;
+ if (*form) {
+ if ((in = open (etcpath (*form), O_RDONLY)) == NOTOK)
+ adios (*form, "unable to open form file");
+ } else {
+ if ((in = open (etcpath (def), O_RDONLY)) == NOTOK)
+ adios (def, "unable to open default components file");
+ *form = def;
+ }
+ return in;
+}