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C phone-number: more comments, code improvement (maybe ;-)

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This commit is contained in:
Bruno Raoult
2021-09-05 12:00:53 +02:00
parent 064f3d27a9
commit c6d39e8702
1 changed files with 9 additions and 8 deletions
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17
c/phone-number/phone_number.c
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@@ -13,12 +13,13 @@
* I made it to offer an option to traditional strtok() or manual string
* parsing.
*/
static char *scan="%m[+(0-9]%*[()-. ]%m[0-9]%*[)-. ]%m[0-9]%*[-. ]%m[0-9]";
char *phone_number_clean(const char *input)
{
char *scan="%m[+(0-9]%*[()-. ]%m[0-9]%*[()-. ]%m[0-9]%*[-. ]%m[0-9]";
char *sn[4];
char *sn[4] = { 0 };
uint64_t num[4];
uint64_t *p = &num[0];
uint64_t *p = &*num;
int nmatch;
char *res;
@@ -31,26 +32,26 @@ char *phone_number_clean(const char *input)
for (int i=0; i<nmatch; ++i) {
*(p+i) = atol(*sn[i] == LPAREN? sn[i]+1: sn[i]);
free(sn[i]);
free(sn[i]); /* due to scanf %m */
}
switch (nmatch) {
case 2:
case 0:
return res;
case 1:
case 1: /* full number */
if (*p > 10000000000) /* 1 000 000 0000 */
*p -= 10000000000;
if (*p > 9999999999 || /* 999 999 9999 */
*p < 2000000000) /* 200 000 0000 */
return res;
break;
case 4: /* area */
case 4: /* country code */
if (*p != 1)
return res;
p++;
p++; /* go to area number */
fallthrough; /* only gcc>=7 & clang>=12 */
case 3: /* last 3 numbers */
case 3: /* start with area number */
if (*p < 200 || *p > 999 ||
*(p+1) < 200 || *(p+1) > 999 ||
*(p+2) > 9999)