2 ** utils.c -- various utility routines
4 ** This code is Copyright (c) 2006, by the authors of nmh. See the
5 ** COPYRIGHT file in the root directory of the nmh distribution for
6 ** complete copyright information.
19 ** We allocate space for messages (msgs array)
20 ** this number of elements at a time.
28 mh_xmalloc(size_t size)
33 adios(EX_SOFTWARE, NULL, "Tried to malloc 0 bytes");
35 memory = malloc(size);
37 adios(EX_OSERR, NULL, "Malloc failed");
43 ** Safely call realloc
46 mh_xrealloc(void *ptr, size_t size)
50 /* Some non-POSIX realloc()s don't cope with realloc(NULL,sz) */
52 return mh_xcalloc((size_t) 1, size);
56 adios(EX_SOFTWARE, NULL, "Tried to realloc 0 bytes");
58 memory = realloc(ptr, size);
60 adios(EX_OSERR, NULL, "Realloc failed");
69 mh_xcalloc(size_t nmemb, size_t size)
73 if (nmemb == 0 || size == 0)
74 adios(EX_SOFTWARE, NULL, "Tried to calloc 0 bytes");
76 if ((memory = calloc(nmemb, size))) {
79 adios(EX_OSERR, NULL, "calloc failed");
84 ** Return the present working directory, if the current directory does not
85 ** exist, or is too long, make / the pwd.
91 static char curwd[PATH_MAX];
93 if (!getcwd(curwd, PATH_MAX)) {
94 admonish(NULL, "unable to determine working directory");
95 if (!mypath || !*mypath ||
96 (strcpy(curwd, mypath), chdir(curwd)) == -1) {
103 if ((cp = curwd + strlen(curwd) - 1) > curwd && *cp == '/') {
104 /* strip trailing slash */
112 ** add -- If "s1" is NULL, this routine just creates a
113 ** -- copy of "s2" into newly malloc'ed memory.
114 ** -- (use getcpy() instead in this case)
116 ** -- If "s1" is not NULL, then copy the concatenation
117 ** -- of "s1" and "s2" (note the order) into newly
118 ** -- malloc'ed memory. Then free "s1".
121 add(char *s2, char *s1)
124 size_t len1 = 0, len2 = 0;
131 cp = mh_xmalloc(len1 + len2 + 1);
133 /* Copy s1 and free it */
135 memcpy(cp, s1, len1);
141 memcpy(cp + len1, s2, len2);
143 /* Now NULL terminate the string */
144 cp[len1 + len2] = '\0';
152 ** Check to see if a folder exists, if not, prompt the user to create it.
155 create_folder(char *folder, int autocreate, void (*done_callback)(int))
161 if (stat(folder, &st) == -1) {
163 adios(EX_IOERR, folder, "error on folder");
164 if (autocreate == 0) {
165 /* ask before creating folder */
166 cp = concat("Create folder \"", folder, "\"? ", NULL);
168 done_callback(EX_CANTCREAT);
170 } else if (autocreate == -1) {
171 /* do not create, so exit */
172 done_callback(EX_CANTCREAT);
174 if (!makedir(folder))
175 adios(EX_CANTCREAT, NULL, "unable to create folder %s", folder);
181 ** Return the number of digits in a nonnegative integer.
190 adios(EX_SOFTWARE, NULL, "oops, num_digits called with negative value");
204 ** Append a message arg to an array of them, resizing it if necessary.
205 ** The function is written to suit the arg parsing code it was extracted
206 ** from, and will probably be changed when the other code is cleaned up.
209 app_msgarg(struct msgs_array *msgs, char *cp)
211 if(msgs->size >= msgs->max)
212 msgs->msgs = mh_xrealloc(msgs->msgs,
213 (msgs->max+=MAXMSGS)*sizeof(*msgs->msgs));
214 msgs->msgs[msgs->size++] = cp;