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efl/eina_prefix: simplify common prefix lookup. 

SVN revision: 82467
This commit is contained in:
Gustavo Sverzut Barbieri 2013-01-09 15:46:05 +00:00
parent ba461e9467
commit da5a568f68
1 changed files with 25 additions and 44 deletions
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69
src/lib/eina/eina_prefix.c
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@ -427,6 +427,23 @@ _get_env_vars(Eina_Prefix *pfx,
return ret;
}
static int
_common_prefix_find(const char *bin, const char *lib, const char *data, const char *locale)
{
const char *b = bin;
const char *i = lib;
const char *d = data;
const char *o = locale;
for (; (*b) && (*i) && (*d) && (*o); b++, i++, d++, o++)
{
if (*b != *i) break;
if (*b != *d) break;
if (*b != *o) break;
}
return b - bin;
}
/**
* @endcond
*/
@ -451,11 +468,7 @@ eina_prefix_new(const char *argv0, void *symbol, const char *envprefix,
Eina_Prefix *pfx;
char *p, buf[4096], *tmp, *magic = NULL;
struct stat st;
const char *p1, *p2;
const char *pkg_bin_p = NULL;
const char *pkg_lib_p = NULL;
const char *pkg_data_p = NULL;
const char *pkg_locale_p = NULL;
int prefixlen;
const char *bindir = "bin";
const char *libdir = "lib";
const char *datadir = "share";
@ -521,47 +534,15 @@ eina_prefix_new(const char *argv0, void *symbol, const char *envprefix,
* libdir = lib/x86_64-linux-gnu
* all with a common prefix that can be relocated
*/
/* 1. check last common char in bin and lib strings */
for (p1 = pkg_bin, p2 = pkg_lib; *p1 && *p2; p1++, p2++)
prefixlen = _common_prefix_find(pkg_bin, pkg_lib, pkg_data, pkg_locale);
if (prefixlen > 0)
{
if (*p1 != *p2)
{
pkg_bin_p = p1;
pkg_lib_p = p2;
break;
}
}
/* 1. check last common char in bin and data strings */
for (p1 = pkg_bin, p2 = pkg_data; *p1 && *p2; p1++, p2++)
{
if (*p1 != *p2)
{
pkg_data_p = p2;
break;
}
}
/* 1. check last common char in bin and locale strings */
for (p1 = pkg_bin, p2 = pkg_locale; *p1 && *p2; p1++, p2++)
{
if (*p1 != *p2)
{
pkg_locale_p = p2;
break;
}
}
/* 2. if all the common string offsets match we compiled with a common prefix */
if (((pkg_bin_p - pkg_bin) == (pkg_lib_p - pkg_lib))
&& ((pkg_bin_p - pkg_bin) == (pkg_data_p - pkg_data))
&& ((pkg_bin_p - pkg_bin) == (pkg_locale_p - pkg_locale))
)
{
bindir = pkg_bin_p;
libdir = pkg_lib_p;
datadir = pkg_data_p;
localedir = pkg_locale_p;
bindir = pkg_bin + prefixlen;
libdir = pkg_lib + prefixlen;
datadir = pkg_data + prefixlen;
localedir = pkg_locale + prefixlen;
DBG("Prefix common=%.*s, bin=%s, lib=%s, data=%s, locale=%s",
(int)(pkg_bin_p - pkg_bin), pkg_bin,
bindir, libdir, datadir, localedir);
prefixlen, pkg_bin, bindir, libdir, datadir, localedir);
}
/* 3. some galoot thought it awesome not to give us a common prefix at compile time
* so fall back to the compile time directories. we are no longer relocatable */