From c9b6b9a5ca082fe7c1b6f58d7713f785a9eb6a5c Mon Sep 17 00:00:00 2001
From: Martial Simon <msimon_fr@hotmail.com>
Date: Mon, 15 Sep 2025 01:08:27 +0200
Subject: add: graphs et rushs

---
 graphs/piscine/evalexpr/src/evalexpr.c | 93 ++++++++++++++++++++++++++++++++++
 1 file changed, 93 insertions(+)
 create mode 100644 graphs/piscine/evalexpr/src/evalexpr.c

(limited to 'graphs/piscine/evalexpr/src/evalexpr.c')

diff --git a/graphs/piscine/evalexpr/src/evalexpr.c b/graphs/piscine/evalexpr/src/evalexpr.c
new file mode 100644
index 0000000..5012355
--- /dev/null
+++ b/graphs/piscine/evalexpr/src/evalexpr.c
@@ -0,0 +1,93 @@
+#include "evalexpr.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define BUFFER_SIZE 10
+
+char *get_input(void)
+{
+    size_t r;
+    char buf[BUFFER_SIZE];
+    size_t size = 0;
+    char *expr = malloc(size * sizeof(char) + 1);
+    if (expr == NULL)
+        return NULL;
+    expr[0] = '\0';
+    do
+    {
+        r = fread(buf, sizeof(char), BUFFER_SIZE - 1, stdin);
+        if (r != 0)
+        {
+            buf[r] = '\0';
+            size += r;
+            char *tmp = realloc(expr, size * sizeof(char) + 1);
+            if (tmp == NULL)
+            {
+                free(expr);
+                return NULL;
+            }
+            expr = tmp;
+            strcat(expr, buf);
+        }
+    } while (r != 0);
+    if (size == 0)
+    {
+        free(expr);
+        return NULL;
+    }
+    if (expr[size - 1] == '\n')
+        expr[size - 1] = '\0';
+    return expr;
+}
+
+void cleanup(char *expr, char *rpn)
+{
+    free(expr);
+    free(rpn);
+}
+
+int main(int argc, char **argv)
+{
+    if ((argc == 2 && strcmp(argv[1], "-rpn") != 0) || (argc > 2))
+        return 4;
+    char *expr = get_input();
+    if (expr == NULL)
+        return 4;
+    if (argc == 1)
+    {
+        char *rpn;
+        int e = shunting_yard(expr, &rpn);
+        if (e != 0)
+            return e;
+        // call shunting yard
+        int retval;
+        e = evalrpn(rpn, &retval);
+        if (e != 0)
+        {
+            cleanup(expr, rpn);
+            return e;
+        }
+        // FREE RPN
+        printf("%d\n", retval);
+        cleanup(expr, rpn);
+        // return
+        return 0;
+    }
+
+    if (argc == 2 && strcmp(argv[1], "-rpn") == 0)
+    {
+        // call rpn eval
+        int retval;
+        int e = evalrpn(expr, &retval);
+        printf("%d\n", retval);
+        // return
+        free(expr);
+        if (e != 0)
+            return e;
+        return 0;
+    }
+
+    return 4;
+}
-- 
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