nrformats-unsigned

nrformats-unsigned.diff

diff --git a/src/ops.c b/src/ops.c
index 9ab355596..e720d0f96 100644
--- a/src/ops.c
+++ b/src/ops.c
@@ -2441,6 +2441,7 @@ do_addsub(
     int                dooct;
     int                dobin;
     int                doalp;
+    int                douns;
     int                firstdigit;
     int                subtract;
     int                negative = FALSE;
@@ -2456,6 +2457,7 @@ do_addsub(
     dooct = (vim_strchr(curbuf->b_p_nf, 'o') != NULL); // "Octal"
     dobin = (vim_strchr(curbuf->b_p_nf, 'b') != NULL); // "Bin"
     doalp = (vim_strchr(curbuf->b_p_nf, 'p') != NULL); // "alPha"
+    douns = (vim_strchr(curbuf->b_p_nf, 'u') != NULL); // "unsigned"

     curwin->w_cursor = *pos;
     ptr = ml_get(pos->lnum);
@@ -2569,7 +2571,8 @@ do_addsub(
            goto theend;

        if (col > pos->col && ptr[col - 1] == '-'
-               && (!has_mbyte || !(*mb_head_off)(ptr, ptr + col - 1)))
+               && (!has_mbyte || !(*mb_head_off)(ptr, ptr + col - 1)
+               && !douns))
        {
            negative = TRUE;
            was_positive = FALSE;
@@ -2635,7 +2638,8 @@ do_addsub(
        if (col > 0 && ptr[col - 1] == '-'
                && (!has_mbyte ||
                    !(*mb_head_off)(ptr, ptr + col - 1))
-               && !visual)
+               && !visual
+               && !douns)
        {
            // negative number
            --col;
diff --git a/src/optionstr.c b/src/optionstr.c
index ff0186f42..a70d02edc 100644
--- a/src/optionstr.c
+++ b/src/optionstr.c
@@ -21,7 +21,7 @@ static char *(p_bo_values[]) = {"all", "backspace", "cursor", "complete",
                                 "hangul", "insertmode", "lang", "mess",
                                 "showmatch", "operator", "register", "shell",
                                 "spell", "wildmode", NULL};
-static char *(p_nf_values[]) = {"bin", "octal", "hex", "alpha", NULL};
+static char *(p_nf_values[]) = {"bin", "octal", "hex", "alpha", "unsigned", NULL};
 static char *(p_ff_values[]) = {FF_UNIX, FF_DOS, FF_MAC, NULL};
 #ifdef FEAT_CRYPT
 static char *(p_cm_values[]) = {"zip", "blowfish", "blowfish2", NULL};