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-rw-r--r--Makefile1
-rw-r--r--libcontacts.h1
-rw-r--r--libcontacts_same_number.c123
3 files changed, 125 insertions, 0 deletions
diff --git a/Makefile b/Makefile
index 8d845fe..4b61012 100644
--- a/Makefile
+++ b/Makefile
@@ -20,6 +20,7 @@ OBJ =\
libcontacts_organisation_destroy.o\
libcontacts_parse_contact.o\
libcontacts_pgpkey_destroy.o\
+ libcontacts_same_number.o\
libcontacts_save_contact.o\
libcontacts_site_destroy.o
diff --git a/libcontacts.h b/libcontacts.h
index 77d07fe..4a2d782 100644
--- a/libcontacts.h
+++ b/libcontacts.h
@@ -295,6 +295,7 @@ int libcontacts_list_contacts(char ***, const struct passwd *);
int libcontacts_load_contact(const char *, struct libcontacts_contact *, const struct passwd *); /* errno = 0 if malformatted */
int libcontacts_load_contacts(struct libcontacts_contact ***, const struct passwd *);
int libcontacts_save_contact(struct libcontacts_contact *, const struct passwd *);
+int libcontacts_same_number(const char *, const char *, const char *, const char *);
char *libcontacts_get_path(const char *, const struct passwd *);
int libcontacts_parse_contact(char *, struct libcontacts_contact *); /* does not load .id, not stored in file, but is the filename */
diff --git a/libcontacts_same_number.c b/libcontacts_same_number.c
new file mode 100644
index 0000000..633fc7e
--- /dev/null
+++ b/libcontacts_same_number.c
@@ -0,0 +1,123 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+
+
+static const char *digits[255] = {
+ ['#'] = "#", ['*'] = "*", ['+'] = "00",
+ ['0'] = "0", ['1'] = "1", ['2'] = "2", ['3'] = "3", ['4'] = "4",
+ ['5'] = "5", ['6'] = "6", ['7'] = "7", ['8'] = "8", ['9'] = "9",
+ ['A'] = "2", ['B'] = "2", ['C'] = "2",
+ ['D'] = "3", ['E'] = "3", ['F'] = "3",
+ ['G'] = "4", ['H'] = "4", ['I'] = "4",
+ ['J'] = "5", ['K'] = "5", ['L'] = "5",
+ ['M'] = "6", ['N'] = "6", ['O'] = "6",
+ ['P'] = "7", ['Q'] = "7", ['R'] = "7", ['S'] = "7",
+ ['T'] = "8", ['U'] = "8", ['V'] = "8",
+ ['W'] = "8", ['X'] = "9", ['Y'] = "9", ['Z'] = "9",
+ ['('] = "(", [')'] = ")" /* For skipping ranges, e.g. the 0 in +46(0)7… shall be skipped when +46 is included */
+ /* Lower case letters are intentionally left out */
+};
+
+static char *
+canonicalise(const char *number, const char *country)
+{
+ size_t nlen = 0, clen = 0, skip;
+ const char *digit, *p;
+ char *ret, *r;
+
+ for (p = number, skip = 0; *p; p++) {
+ digit = digits[*p & 255];
+ if (digit) {
+ if (*digit == '(')
+ skip += 1;
+ else if (*digit == ')')
+ skip -= !!skip;
+ else
+ nlen += digit[1] ? 2 : 1;
+ }
+ }
+
+ for (p = country, skip = 0; *p; p++) {
+ digit = digits[*p & 255];
+ if (digit) {
+ if (*digit == '(')
+ skip += 1;
+ else if (*digit == ')')
+ skip -= !!skip;
+ else
+ clen += digit[1] ? 2 : 1;
+ }
+ }
+
+ ret = malloc(nlen + clen + 3);
+ if (!ret)
+ return NULL;
+
+ for (r = ret, p = number, skip = 0; *p; p++) {
+ digit = digits[*p & 255];
+ if (digit) {
+ if (*digit == '(') {
+ skip += 1;
+ } else if (*digit == ')') {
+ skip -= !!skip;
+ } else if (!skip) {
+ *r++ = digit[0];
+ if (digit[1])
+ *r++ = digit[1];
+ }
+ }
+ }
+ *r = '\0';
+
+ if (ret[0] != '0' || ret[1] == '0' || !*country)
+ return ret;
+
+ memmove(&ret[clen], &ret[1], nlen);
+
+ for (r = ret, p = country, skip = 0; *p; p++) {
+ digit = digits[*p & 255];
+ if (digit) {
+ if (*digit == '(') {
+ skip += 1;
+ } else if (*digit == ')') {
+ skip -= !!skip;
+ } else if (!skip) {
+ *r++ = digit[0];
+ if (digit[1])
+ *r++ = digit[1];
+ }
+ }
+ }
+
+ if (ret[0] == '0' && ret[1] == '0')
+ return ret;
+
+ memmove(&ret[2], ret, nlen + clen);
+ ret[0] = ret[1] = '0';
+ return ret;
+}
+
+int
+libcontacts_same_number(const char *a, const char *a_country, const char *b, const char *b_country)
+{
+ char *a_full, *b_full;
+ int ret;
+
+ if (!a || !*a || !b || !*b) {
+ errno = EINVAL;
+ return -1;
+ }
+
+ a_full = canonicalise(a, a_country ? a_country : "");
+ if (!a_full)
+ return -1;
+ b_full = canonicalise(b, b_country ? b_country : "");
+ if (!b_full) {
+ free(a_full);
+ return -1;
+ }
+ ret = !strcmp(a_full, b_full);
+ free(a_full);
+ free(b_full);
+ return ret;
+}