split_on_separator: move to a separate file

To be able to include split_on_separator() without additional
dependencies (only talloc), it is moved into a separate file.

Related to https://pagure.io/SSSD/sssd/issue/3050

Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>
Reviewed-by: Lukáš Slebodník <lslebodn@redhat.com>

1 files changed, 121 insertions, 0 deletions

diff --git a/src/util/util_ext.c b/src/util/util_ext.c
new file mode 100644
index 000000000..fceb8c873
--- /dev/null
+++ b/src/util/util_ext.c
@@ -0,0 +1,121 @@
+/*
+   SSSD helper calls - can be used by libraries for external use as well
+
+    Authors:
+        Simo Sorce <ssorce@redhat.com>
+
+    Copyright (C) 2017 Red Hat
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <talloc.h>
+#include <stdbool.h>
+#include <errno.h>
+#include <ctype.h>
+
+#define EOK 0
+
+int split_on_separator(TALLOC_CTX *mem_ctx, const char *str,
+                       const char sep, bool trim, bool skip_empty,
+                       char ***_list, int *size)
+{
+    int ret;
+    const char *substr_end = str;
+    const char *substr_begin = str;
+    const char *sep_pos = NULL;
+    size_t substr_len;
+    char **list = NULL;
+    int num_strings = 0;
+    TALLOC_CTX *tmp_ctx = NULL;
+
+    if (str == NULL || *str == '\0' || _list == NULL) {
+        return EINVAL;
+    }
+
+    tmp_ctx = talloc_new(NULL);
+    if (tmp_ctx == NULL) {
+        return ENOMEM;
+    }
+
+    do {
+        substr_len = 0;
+
+        /* If this is not the first substring, then move from the separator. */
+        if (sep_pos != NULL) {
+            substr_end = sep_pos + 1;
+            substr_begin = sep_pos + 1;
+        }
+
+        /* Find end of the first substring */
+        while (*substr_end != sep && *substr_end != '\0') {
+            substr_end++;
+            substr_len++;
+        }
+
+        sep_pos = substr_end;
+
+        if (trim) {
+            /* Trim leading whitespace */
+            while (isspace(*substr_begin) && substr_begin < substr_end) {
+                substr_begin++;
+                substr_len--;
+            }
+
+            /* Trim trailing whitespace */
+            while (substr_end - 1 > substr_begin && isspace(*(substr_end-1))) {
+                substr_end--;
+                substr_len--;
+            }
+        }
+
+        /* Copy the substring to the output list of strings */
+        if (skip_empty == false || substr_len > 0) {
+            list = talloc_realloc(tmp_ctx, list, char*, num_strings + 2);
+            if (list == NULL) {
+                ret = ENOMEM;
+                goto done;
+            }
+
+            /* empty string is stored for substr_len == 0 */
+            list[num_strings] = talloc_strndup(list, substr_begin, substr_len);
+            if (list[num_strings] == NULL) {
+                ret = ENOMEM;
+                goto done;
+            }
+            num_strings++;
+        }
+
+    } while (*sep_pos != '\0');
+
+    if (list == NULL) {
+        /* No allocations were done, make space for the NULL */
+        list = talloc(tmp_ctx, char *);
+        if (list == NULL) {
+            ret = ENOMEM;
+            goto done;
+        }
+    }
+    list[num_strings] = NULL;
+
+    if (size) {
+        *size = num_strings;
+    }
+
+    *_list = talloc_steal(mem_ctx, list);
+    ret = EOK;
+done:
+    talloc_free(tmp_ctx);
+    return ret;
+}