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/*
* Copyright 2005 Gentoo Foundation
* Distributed under the terms of the GNU General Public License v2
* $Header: /var/cvsroot/gentoo-projects/portage-utils/libq/atom_explode.c,v 1.11 2005/10/25 00:36:21 vapier Exp $
*
* Copyright 2005 Ned Ludd - <solar@gentoo.org>
* Copyright 2005 Mike Frysinger - <vapier@gentoo.org>
*/
typedef struct {
char *CATEGORY;
char *PN;
int PR_int;
char *PV, *PVR;
char *P;
} depend_atom;
depend_atom *atom_explode(const char *atom);
depend_atom *atom_explode(const char *atom)
{
depend_atom *ret;
char *ptr, *ptr_tmp;
size_t len, slen;
int i;
const char *suffixes[] = { "_alpha", "_beta", "_pre", "_rc", "_p", NULL };
/* we allocate mem for atom struct and two strings (strlen(atom)).
* the first string is for CAT/PN/PV while the second is for PVR.
* PVR needs an extra byte for the 'r' which is injected. */
slen = strlen(atom);
len = sizeof(*ret) + slen * sizeof(*atom) * 3 + 3 + 1;
ret = (depend_atom*)xmalloc(len);
memset(ret, 0x00, len);
ptr = (char*)ret;
ret->P = ptr + sizeof(*ret);
ret->PVR = ret->P + slen + 1;
ret->CATEGORY = ret->PVR + slen + 1 + 1;
memcpy(ret->CATEGORY, atom, slen);
/* break up the CATEOGRY and PVR */
if ((ptr = strrchr(ret->CATEGORY, '/')) != NULL) {
ret->PN = ptr+1;
*ptr = '\0';
/* eat extra crap in case it exists */
if ((ptr = strrchr(ret->CATEGORY, '/')) != NULL)
ret->CATEGORY = ptr+1;
} else {
ret->PN = ret->CATEGORY;
ret->CATEGORY = NULL;
}
/* eat file name crap */
if ((ptr = strstr(ret->PN, ".ebuild")) != NULL)
*ptr = '\0';
/* find -r# */
ptr = ret->PN + strlen(ret->PN) - 1;
while (*ptr && ptr > ret->PN) {
if (!isdigit(*ptr)) {
if (ptr[0] == 'r' && ptr[-1] == '-') {
ret->PR_int = atoi(ptr+1);
ptr[-1] = '\0';
}
break;
}
--ptr;
}
/* search for the special suffixes */
i = -1;
if (strchr(ret->PN, '_') == NULL)
goto no_suffix_opt;
for (i = 0; i >= 0 && suffixes[i]; ++i) {
ptr_tmp = ret->PN;
retry_suffix:
if ((ptr = strstr(ptr_tmp, suffixes[i])) == NULL)
continue;
/* check this is a real suffix and not _p hitting mod_perl */
/* note: '_suff-' in $PN is accepted, but no one uses that ... */
len = strlen(ptr);
slen = strlen(suffixes[i]);
if (slen > len) continue;
if (ptr[slen] && !isdigit(ptr[slen]) && ptr[slen]!='-') {
/* ok, it was a fake out ... lets skip this
* fake and try to match the suffix again */
ptr_tmp = ptr + 1;
goto retry_suffix;
}
eat_version:
/* allow for 1 optional suffix letter */
if (ptr[-1] >= 'a' && ptr[-1] <= 'z') {
ptr_tmp = ptr--;
while (--ptr > ret->PN)
if (*ptr != '.' && !isdigit(*ptr))
break;
if (*ptr != '-') {
ptr = ptr_tmp;
}
}
/* eat the trailing version number [-.0-9]+ */
ptr_tmp = ptr;
while (--ptr > ret->PN)
if (*ptr == '-') {
ptr_tmp = ptr;
continue;
} else if (*ptr != '-' && *ptr != '.' && !isdigit(*ptr))
break;
if (*ptr_tmp) {
ret->PV = ptr_tmp+1;
ret->PV[-1] = '\0';
goto found_pv;
} else {
/* atom has no version */
ret->PV = ret->PVR = NULL;
return ret;
}
break;
}
if (i <= -3)
errf("Hrm, seem to have hit an infinite loop with %s", atom);
i = -1;
if (ret->PV) {
found_pv:
sprintf(ret->PVR, "%s-r%i", ret->PV, ret->PR_int);
sprintf(ret->P, "%s-%s", ret->PN, (ret->PR_int ? ret->PVR : ret->PV));
} else {
no_suffix_opt:
--i;
ptr = ret->PN + strlen(ret->PN);
goto eat_version;
}
return ret;
}
void atom_implode(depend_atom *atom);
void atom_implode(depend_atom *atom)
{
if (!atom)
errf("Atom is empty !");
free(atom);
}
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