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.
25 ** Safely call realloc
28 mh_xrealloc(void *ptr, size_t size)
32 /* Some non-POSIX realloc()s don't cope with realloc(NULL,sz) */
34 return mh_xcalloc(1, size);
37 adios(EX_SOFTWARE, NULL, "Tried to realloc 0 bytes");
40 memory = realloc(ptr, size);
42 adios(EX_OSERR, NULL, "Realloc failed");
52 mh_xcalloc(size_t nmemb, size_t size)
56 if (nmemb == 0 || size == 0) {
57 adios(EX_SOFTWARE, NULL, "Tried to calloc 0 bytes");
60 if ((memory = calloc(nmemb, size))) {
63 adios(EX_OSERR, NULL, "calloc failed");
68 ** Free a pointer and set it to NULL.
80 ** Return the present working directory, if the current directory does not
81 ** exist, or is too long, make / the pwd.
87 static char curwd[PATH_MAX];
89 if (!getcwd(curwd, PATH_MAX)) {
90 admonish(NULL, "unable to determine working directory");
91 if (!mypath || !*mypath ||
92 (strcpy(curwd, mypath), chdir(curwd)) == -1) {
99 if ((cp = curwd + strlen(curwd) - 1) > curwd && *cp == '/') {
100 /* strip trailing slash */
108 ** add -- If "s1" is NULL, this routine just creates a
109 ** -- copy of "s2" into newly malloc'ed memory.
110 ** -- (use mh_xstrdup() instead in this case)
112 ** -- If "s1" is not NULL, then copy the concatenation
113 ** -- of "s1" and "s2" (note the order) into newly
114 ** -- malloc'ed memory. Then free "s1".
117 add(const char *s2, char *s1)
120 size_t len1 = 0, len2 = 0;
129 cp = mh_xcalloc(len1 + len2 + 1, sizeof(char));
131 /* Copy s1 and free it */
133 memcpy(cp, s1, len1);
139 memcpy(cp + len1, s2, len2);
142 /* Now NULL terminate the string */
143 cp[len1 + len2] = '\0';
151 ** Check to see if a folder exists, if not, prompt the user to create it.
154 create_folder(char *folder, int autocreate, void (*done_callback)(int))
160 if (stat(folder, &st) == -1) {
161 if (errno != ENOENT) {
162 adios(EX_IOERR, folder, "error on folder");
164 if (autocreate == 0) {
165 /* ask before creating folder */
166 cp = concat("Create folder \"", folder, "\"? ", NULL);
167 if (!getanswer(cp)) {
168 done_callback(EX_CANTCREAT);
171 } else if (autocreate == -1) {
172 /* do not create, so exit */
173 done_callback(EX_CANTCREAT);
175 if (!makedir(folder)) {
176 adios(EX_CANTCREAT, NULL, "unable to create folder %s", folder);
183 ** Return the number of digits in a nonnegative integer.
192 adios(EX_SOFTWARE, NULL, "oops, num_digits called with negative value");
208 ** Append a message arg to an array of them, resizing it if necessary.
209 ** The function is written to suit the arg parsing code it was extracted
210 ** from, and will probably be changed when the other code is cleaned up.
213 app_msgarg(struct msgs_array *msgs, char *cp)
215 if(msgs->size >= msgs->max) {
216 msgs->msgs = mh_xrealloc(msgs->msgs,
217 (msgs->max+=MAXMSGS)*sizeof(*msgs->msgs));
219 msgs->msgs[msgs->size++] = cp;
223 ** mh_xstrdup() is a wrapper of strdup() to replace getcpy(). It returns
224 ** a copy of its argument if this is nonnull; otherwise, it returns a
225 ** string of length 0.
228 mh_xstrdup(const char * s)
231 tmp = strdup(s ? s : "");
233 adios(EX_OSERR, "strdup", "can't copy string");