Initial import of xbps-cmpver

--HG--
extra : convert_revision : 57260b5d7bfc45cb2e2c877fad2fdcae155c0a75

utils/xbps-cmpver.c

@@ -0,0 +1,81 @@
+/* 
+ * Compare package and version strings
+ * @ 2008
+ * Author: pancake <youterm.com>
+ */
+#include <stdio.h>
+#include <string.h>
+
+static int chkchr(const char *ch)
+{
+	if (*ch>='0' && *ch<='9')
+		return *ch-'0';
+	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 chkver(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 chkpkg(const char *a0, const char *b0)
+{
+	char *a = strchr(a0, '-');
+	char *b = strchr(b0, '-');
+
+	if (a == NULL || b== NULL) {
+		fprintf(stderr, "Invalid package names\n");
+		return 0;
+	}
+	return chkver(a+1, b+1);
+}
+
+#if UNIT_TEST
+	printf("1.2 2.2 = %d\n", chkver("1.2", "2.2"));
+	printf("1.0 10.3 = %d\n", chkver("1.0", "10.3"));
+	printf("1.0 1.0  = %d\n", chkver("1.0", "1.0"));
+	printf("1.0 1.2  = %d\n", chkver("1.0", "1.2"));
+	printf("1.0.1 1.0.2 = %d\n", chkver("1.0.1", "1.0.2"));
+	printf("1.0beta 1.0rc1 = %d\n", chkver("1.0beta", "1.0rc1"));
+#endif
+
+int main(int argc, char **argv)
+{
+	if (argc<3) {
+		printf("Usage: ./xbps-cmpver [old] [new]\n");
+		printf(" ./xbpks-cmpver foo-1.2 foo-2.2   # $? = 1\n");
+		printf(" ./xbpks-cmpver foo-1.2 foo-1.2   # $? = 0\n");
+		return 1;
+	}
+	return (chkpkg(argv[1], argv[2]) > 0)?1:0;
+}