add less_than_int, greater_than_int to edify
Add functions less_than_int() and greater_than_int() that interpret
their args as ints and do the comparison. ("<" and ">" operators, if
implemented, should do string comparison.) This lets us do the build
time check currently done by the check_prereq binary.
diff --git a/edify/expr.c b/edify/expr.c
index 406c67e..f1c5555 100644
--- a/edify/expr.c
+++ b/edify/expr.c
@@ -72,6 +72,8 @@
char* IfElseFn(const char* name, State* state, int argc, Expr* argv[]) {
if (argc != 2 && argc != 3) {
+ free(state->errmsg);
+ state->errmsg = strdup("ifelse expects 2 or 3 arguments");
return NULL;
}
char* cond = Evaluate(state, argv[0]);
@@ -244,6 +246,54 @@
return Evaluate(state, argv[1]);
}
+char* LessThanIntFn(const char* name, State* state, int argc, Expr* argv[]) {
+ if (argc != 2) {
+ free(state->errmsg);
+ state->errmsg = strdup("less_than_int expects 2 arguments");
+ return NULL;
+ }
+
+ char* left;
+ char* right;
+ if (ReadArgs(state, argv, 2, &left, &right) < 0) return NULL;
+
+ bool result = false;
+ char* end;
+
+ long l_int = strtol(left, &end, 10);
+ if (left[0] == '\0' || *end != '\0') {
+ fprintf(stderr, "[%s] is not an int\n", left);
+ goto done;
+ }
+
+ long r_int = strtol(right, &end, 10);
+ if (right[0] == '\0' || *end != '\0') {
+ fprintf(stderr, "[%s] is not an int\n", right);
+ goto done;
+ }
+
+ result = l_int < r_int;
+
+ done:
+ free(left);
+ free(right);
+ return strdup(result ? "t" : "");
+}
+
+char* GreaterThanIntFn(const char* name, State* state, int argc, Expr* argv[]) {
+ if (argc != 2) {
+ free(state->errmsg);
+ state->errmsg = strdup("greater_than_int expects 2 arguments");
+ return NULL;
+ }
+
+ Expr* temp[2];
+ temp[0] = argv[1];
+ temp[1] = argv[0];
+
+ return LessThanIntFn(name, state, 2, temp);
+}
+
char* Literal(const char* name, State* state, int argc, Expr* argv[]) {
return strdup(name);
}
@@ -313,6 +363,9 @@
RegisterFunction("is_substring", SubstringFn);
RegisterFunction("stdout", StdoutFn);
RegisterFunction("sleep", SleepFn);
+
+ RegisterFunction("less_than_int", LessThanIntFn);
+ RegisterFunction("greater_than_int", GreaterThanIntFn);
}