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RRTcodebaseC

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/* build a more or less unique string based on the timestamp and one receiver -
for our purposes, this seems "good enough" for the moment, esp. as clients normally set Message-ID on sent. */
return dc_mprintf("%lu-%lu-%lu@stub", (unsigned long)message_timestamp, (unsigned long)contact_id_from, (unsigned long)largest_id_to);
}
char* dc_extract_grpid_from_rfc724_mid(const char* mid)
{
/* extract our group ID from Message-IDs as `Gr.12345678901.morerandom@domain.de`; "12345678901" is the wanted ID in this example. */
int success = 0;
char* grpid = NULL;
char* p1 = NULL;
int grpid_len = 0;
if (mid==NULL || strlen(mid)<8 || mid[0]!='G' || mid[1]!='r' || mid[2]!='.') {
goto cleanup;
}
grpid = dc_strdup(&mid[3]);
p1 = strchr(grpid, '.');
if (p1==NULL) {
goto cleanup;
}
*p1 = 0;
#define DC_ALSO_VALID_ID_LEN 16 /* length returned by create_adhoc_grp_id() */
grpid_len = strlen(grpid);
if (grpid_len!=DC_CREATE_ID_LEN && grpid_len!=DC_ALSO_VALID_ID_LEN) { /* strict length comparison, the 'Gr.' magic is weak enough */
goto cleanup;
}
success = 1;
cleanup:
if (success==0) { free(grpid); grpid = NULL; }
return success? grpid : NULL;
}
char* dc_extract_grpid_from_rfc724_mid_list(const clist* list)
{
if (list) {
for (clistiter* cur = clist_begin(list); cur!=NULL ; cur=clist_next(cur)) {
const char* mid = clist_content(cur);
char* grpid = dc_extract_grpid_from_rfc724_mid(mid);
if (grpid) {
return grpid;
}
}
}
return NULL;
}
/*******************************************************************************
* file tools
******************************************************************************/
/*
* removes trailing slash from given path.
*/
void dc_ensure_no_slash(char* pathNfilename)
{
int path_len = strlen(pathNfilename);
if (path_len > 0) {
if (pathNfilename[path_len-1]=='/'
|| pathNfilename[path_len-1]=='\\') {
pathNfilename[path_len-1] = 0;
}
}
}
void dc_validate_filename(char* filename)
{
/* function modifies the given buffer and replaces all characters not valid in filenames by a "-" */
char* p1 = filename;
while (*p1) {
if (*p1=='/' || *p1=='\\' || *p1==':') {
*p1 = '-';
}
p1++;
}
}
char* dc_get_filename(const char* pathNfilename)
{
const char* p = strrchr(pathNfilename, '/');
if (p==NULL) {
p = strrchr(pathNfilename, '\\');
}
if (p) {
p++;
return dc_strdup(p);
}