[hackers] [sbase] sort: work with signed integers as well || Jakob Kramer

[git]

commit 0723c8d32eabcb326381235e4aed265ee93af7b4
Author: Jakob Kramer <jakob.kra...@gmx.de>
Date:   Tue May 6 13:35:06 2014 +0200

    sort: work with signed integers as well

diff --git a/sort.c b/sort.c
index 0f19b44..1d5f325 100644
--- a/sort.c
+++ b/sort.c
@@ -9,10 +9,10 @@
 #include "util.h"
 
 struct keydef {
-       unsigned start_column;
-       unsigned end_column;
-       unsigned start_char;
-       unsigned end_char;
+       int start_column;
+       int end_column;
+       int start_char;
+       int end_char;
 };
 
 struct kdlist {
@@ -146,7 +146,7 @@ linecmp(const char **a, const char **b)
                else if(!(node == head) && !node->next)
                        res = strcmp(s1, s2);
                else if(nflag)
-                       res = strtoul(s1, 0, 10) - strtoul(s2, 0, 10);
+                       res = strtol(s1, 0, 10) - strtol(s2, 0, 10);
                else
                        res = strcmp(s1, s2);
 
@@ -167,17 +167,22 @@ parse_keydef(struct keydef *kd, char *s)
        kd->end_column = 0;
        kd->end_char = 0;
 
-       kd->start_column = strtoul(rest, &rest, 10);
-       if(!kd->start_column)
-               enprintf(2, "starting column cannot be 0
");
+       kd->start_column = strtol(rest, &rest, 10);
+       if(kd->start_column < 1)
+               return -1;
        if(*rest == '.')
-               kd->start_char = strtoul(rest+1, &rest, 10);
+               kd->start_char = strtol(rest+1, &rest, 10);
+       if(kd->start_char < 1)
+               return -1;
        if(*rest == ',') {
-               kd->end_column = strtoul(rest+1, &rest, 10);
+               kd->end_column = strtol(rest+1, &rest, 10);
                if(kd->end_column && kd->end_column < kd->start_column)
-                       enprintf(2, ",%u is too small
", kd->end_column);
-               if(*rest == '.')
-                       kd->end_char = strtoul(rest+1, &rest, 10);
+                       return -1;
+               if(*rest == '.') {
+                       kd->end_char = strtol(rest+1, &rest, 10);
+                       if(kd->end_char < 1)
+                               return -1;
+               }
        }
        if(*rest != '