From: Stephen Warren swarren@nvidia.com
Currently, ! can only be parsed as the first operator in an expression. This prevents the following from working:
$ if test ! ! 1 -eq 1; then echo yes; else echo no; fi yes $ if test ! 1 -eq 2 -a ! 3 -eq 4; then echo yes; else echo no; fi yes
Fix this by parsing ! like any other operator, and and handling it similarly to -a and -o.
Signed-off-by: Stephen Warren swarren@nvidia.com --- v3: New patch. --- common/cmd_test.c | 43 ++++++++++++++++++++++++------------------- 1 file changed, 24 insertions(+), 19 deletions(-)
diff --git a/common/cmd_test.c b/common/cmd_test.c index e65dd531877e..b927d09eb3e0 100644 --- a/common/cmd_test.c +++ b/common/cmd_test.c @@ -18,6 +18,7 @@ #include <command.h>
#define OP_INVALID 0 +#define OP_NOT 1 #define OP_OR 2 #define OP_AND 3 #define OP_STR_EMPTY 4 @@ -49,6 +50,7 @@ const struct { {1, "-le", OP_INT_LE, 3}, {1, "-gt", OP_INT_GT, 3}, {1, "-ge", OP_INT_GE, 3}, + {0, "!", OP_NOT, 1}, {0, "-o", OP_OR, 1}, {0, "-a", OP_AND, 1}, {0, "-z", OP_STR_EMPTY, 2}, @@ -58,7 +60,7 @@ const struct { static int do_test(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { char * const *ap; - int i, op, left, adv, expr, last_expr, neg, last_cmp; + int i, op, left, adv, expr, last_expr, last_unop, last_binop;
/* args? */ if (argc < 3) @@ -73,17 +75,11 @@ static int do_test(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) } #endif
- last_expr = 0; - left = argc - 1; ap = argv + 1; - if (left > 0 && strcmp(ap[0], "!") == 0) { - neg = 1; - ap++; - left--; - } else - neg = 0; - + left = argc - 1; + ap = argv + 1; expr = -1; - last_cmp = OP_INVALID; + last_unop = OP_INVALID; + last_binop = OP_INVALID; last_expr = -1; while (left > 0) { for (i = 0; i < ARRAY_SIZE(op_adv); i++) { @@ -152,27 +148,36 @@ static int do_test(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) switch (op) { case OP_OR: last_expr = expr; - last_cmp = OP_OR; + last_binop = OP_OR; break; case OP_AND: last_expr = expr; - last_cmp = OP_AND; + last_binop = OP_AND; + break; + case OP_NOT: + if (last_unop == OP_NOT) + last_unop = OP_INVALID; + else + last_unop = OP_NOT; break; default: - if (last_cmp == OP_OR) + if (last_unop == OP_NOT) { + expr = !expr; + last_unop = OP_INVALID; + } + + if (last_binop == OP_OR) expr = last_expr || expr; - else if (last_cmp == OP_AND) + else if (last_binop == OP_AND) expr = last_expr && expr; - last_cmp = OP_INVALID; + last_binop = OP_INVALID; + break; }
ap += adv; left -= adv; }
- if (neg) - expr = !expr; - expr = !expr;
debug (": returns %d\n", expr);