Checkpoint for installation of binary packages.

--HG--
extra : convert_revision : 0bc55ebae04b2e1e5ab20feca786b649fc2e0335

lib/cmpver.c

@@ -0,0 +1,66 @@
+/* 
+ * Compare package and version strings
+ * @ 2008
+ * Author: pancake <youterm.com>
+ */
+#include <stdio.h>
+#include <string.h>
+#include <xbps_api.h>
+
+static int chkchr(const char *ch)
+{
+	if (*ch>='0' && *ch<='9')
+		return *ch-'0';
+	if (ch[1]=='\0') {
+		if (*ch>='a'&&*ch<='z'){
+			return *ch-'a';
+		}
+	}
+	switch(*ch) {
+	case 'a': if (ch[1]=='l')
+			return 0xa;
+		return -1;
+	case 'b': return 0xb;
+	case 'r': return 0xc;
+	}
+	return -1;
+}
+
+static int ver2int(const char *a0, int *pow, int mpow)
+{
+	int r,ret = 0;
+	int pos = 0;
+	const char *a = a0+strlen(a0)-1;
+	for(*pow=0;a>=a0;a=a-1) {
+		if (*a=='.') {
+			 *pow=*pow+1;
+		} else {
+			r = chkchr(a);
+			if (r != -1)
+				ret+=((r+1)*((*pow)+1))<<pos++;
+		}
+		if (mpow>0 && *pow > mpow)
+			break;
+	}
+	return ret;
+}
+
+int
+xbps_cmpver_versions(const char *a0, const char *a1)
+{
+	int p0,p1;
+	int v0 = ver2int(a0, &p0, 0);
+	int v1 = ver2int(a1, &p1, p0);
+	return v1-v0;
+}
+
+int
+xbps_cmpver_packages(const char *a0, const char *b0)
+{
+	char *a = strrchr(a0, '-');
+	char *b = strrchr(b0, '-');
+
+	assert(a != NULL || b != NULL);
+
+	return xbps_cmpver_versions(a+1, b+1);
+}