int url_open(URLContext **puc, const char *filename, int flags) { URLProtocol *up; const char *p; char proto_str[128], *q; p = filename; q = proto_str; while (*p != '\0' && *p != ':') { /* protocols can only contain alphabetic chars */ if (!isalpha(*p)) goto file_proto; if ((q - proto_str) < sizeof(proto_str) - 1) *q++ = *p; p++; } /* if the protocol has length 1, we consider it is a dos drive */ if (*p == '\0' || (q - proto_str) <= 1) { file_proto: strcpy(proto_str, "file"); } else { *q = '\0'; } up = first_protocol; while (up != NULL) { if (!strcmp(proto_str, up->name)) return url_open_protocol (puc, up, filename, flags); up = up->next; } *puc = NULL; return AVERROR(ENOENT); }
int url_open(URLContext **puc, const char *filename, int flags) { URLProtocol *up; const char *p; char proto_str[128], *q; p = filename; q = proto_str; while (*p != '\0' && *p != ':') {   if (!isalpha(*p)) goto file_proto; if ((q - proto_str) < sizeof(proto_str) - 1) *q++ = *p; p++; }   if (*p == '\0' || (q - proto_str) <= 1) { file_proto: strcpy(proto_str, "file"); } else { *q = '\0'; } up = first_protocol; while (up != NULL) { if (!strcmp(proto_str, up->name)) return url_open_protocol (puc, up, filename, flags); up = up->next; } *puc = NULL; return AVERROR(ENOENT); }