Merge commit 'fml/master'

[adu.git] / string.c

diff --git a/string.c b/string.c
index 8bd34460877a389a40a85bccb67dfed49ead9871..87f9c265984d1a1b160b8bf784a273e417c46198 100644 (file)
--- a/string.c
+++ b/string.c
@@ -25,7 +25,7 @@
  *
  * \sa realloc(3).
  */
-__must_check __malloc void *para_realloc(void *p, size_t size)
+__must_check __malloc void *adu_realloc(void *p, size_t size)
 {
        /*
         * No need to check for NULL pointers: If p is NULL, the  call
@@ -52,7 +52,7 @@ __must_check __malloc void *para_realloc(void *p, size_t size)
  *
  * \sa malloc(3).
  */
-__must_check __malloc void *para_malloc(size_t size)
+__must_check __malloc void *adu_malloc(size_t size)
 {
        assert(size);
        void *p = malloc(size);
@@ -77,9 +77,9 @@ __must_check __malloc void *para_malloc(size_t size)
  *
  * \sa calloc(3)
  */
-__must_check __malloc void *para_calloc(size_t size)
+__must_check __malloc void *adu_calloc(size_t size)
 {
-       void *ret = para_malloc(size);
+       void *ret = adu_malloc(size);
 
        memset(ret, 0, size);
        return ret;
@@ -98,7 +98,7 @@ __must_check __malloc void *para_calloc(size_t size)
  *
  * \sa strdup(3)
  */
-__must_check __malloc char *para_strdup(const char *s)
+__must_check __malloc char *adu_strdup(const char *s)
 {
        char *ret;
 
@@ -148,7 +148,7 @@ __must_check __printf_1_2 __malloc char *make_message(const char *fmt, ...)
  *
  * \sa strtol(3), atoi(3).
  */
-int para_atoi64(const char *str, int64_t *value)
+__must_check int atoi64(const char *str, int64_t *result)
 {
        char *endptr;
        long long tmp;
@@ -163,6 +163,140 @@ int para_atoi64(const char *str, int64_t *value)
                return -E_ATOI_NO_DIGITS;
        if (*endptr != '\0') /* Further characters after number */
                return -E_ATOI_JUNK_AT_END;
-       *value = tmp;
+       *result = tmp;
        return 1;
 }
+
+/**
+ * Split string and return pointers to its parts.
+ *
+ * \param args The string to be split.
+ * \param argv_ptr Pointer to the list of substrings.
+ * \param delim Delimiter.
+ *
+ * This function modifies \a args by replacing each occurance of \a delim by
+ * zero. A \p NULL-terminated array of pointers to char* is allocated dynamically
+ * and these pointers are initialized to point to the broken-up substrings
+ * within \a args. A pointer to this array is returned via \a argv_ptr.
+ *
+ * \return The number of substrings found in \a args.
+ */
+__must_check unsigned split_args(char *args, char *** const argv_ptr, const char *delim)
+{
+       char *p = args;
+       char **argv;
+       size_t n = 0, i, j;
+
+       p = args + strspn(args, delim);
+       for (;;) {
+               i = strcspn(p, delim);
+               if (!i)
+                       break;
+               p += i;
+               n++;
+               p += strspn(p, delim);
+       }
+       *argv_ptr = adu_malloc((n + 1) * sizeof(char *));
+       argv = *argv_ptr;
+       i = 0;
+       p = args + strspn(args, delim);
+       while (p) {
+               argv[i] = p;
+               j = strcspn(p, delim);
+               if (!j)
+                       break;
+               p += strcspn(p, delim);
+               if (*p) {
+                       *p = '\0';
+                       p++;
+                       p += strspn(p, delim);
+               }
+               i++;
+       }
+       argv[n] = NULL;
+       return n;
+}
+
+static int check_uid_arg(const char *arg, uint32_t *uid)
+{
+       const uint32_t max = ~0U;
+       /*
+        * we need an 64-bit int for string -> uid conversion because strtoll()
+        * returns a signed value.
+        */
+       int64_t val;
+       int ret = atoi64(arg, &val);
+
+       if (ret < 0)
+               return ret;
+       if (val < 0 || val > max)
+               return -ERRNO_TO_ERROR(EINVAL);
+       *uid = val;
+       return 1;
+}
+
+int parse_uid_range(const char *orig_arg, struct uid_range *ur)
+{
+       int ret;
+       char *arg = adu_strdup(orig_arg), *p = strchr(arg, '-');
+
+       if (!p || p == arg) { /* -42 or 42 */
+               ret = check_uid_arg(p? p + 1 : arg, &ur->high);
+               if (ret < 0)
+                       goto out;
+               ur->low = p? 0 : ur->high;
+               ret = 1;
+               goto out;
+       }
+       /* 42- or 42-4711 */
+       *p = '\0';
+       p++;
+       ret = check_uid_arg(arg, &ur->low);
+       if (ret < 0)
+               goto out;
+       ur->high = ~0U;
+       if (*p) { /* 42-4711 */
+               ret = check_uid_arg(p, &ur->high);
+               if (ret < 0)
+                       goto out;
+       }
+       if (ur->low > ur->high)
+               ret = -ERRNO_TO_ERROR(EINVAL);
+out:
+       if (ret < 0)
+               ERROR_LOG("bad uid option: %s\n", orig_arg);
+       else
+               INFO_LOG("admissible uid range: %u - %u\n", ur->low,
+                       ur->high);
+       free(arg);
+       return ret;
+}
+
+int parse_uid_arg(const char *orig_arg, struct uid_range **ur)
+{
+       char *arg, **argv;
+       unsigned n;
+       int i, ret = 1;
+
+       if (!orig_arg)
+               return 0;
+       arg = adu_strdup(orig_arg);
+       n = split_args(arg, &argv, ",");
+       if (!n)
+               return -E_SYNTAX;
+       *ur = adu_malloc((n + 1) * sizeof(struct uid_range));
+       for (i = 0; i < n; i++) {
+               ret = parse_uid_range(argv[i], *ur + i);
+               if (ret < 0)
+                       break;
+       }
+       free(arg);
+       if (ret < 0) {
+               free(*ur);
+               *ur = NULL;
+       }
+       /* an empty range indicates the end of the list */
+       (*ur)[n].low = 1;
+       (*ur)[n].high = 0;
+       return n;
+}