1 files changed, 94 insertions, 0 deletions
diff --git a/42sh/src/builtins/echo.c b/42sh/src/builtins/echo.c
new file mode 100644
index 0000000..f330050
--- /dev/null
+++ b/42sh/src/builtins/echo.c
@@ -0,0 +1,94 @@
+#include <stdio.h>
+#include <string.h>
+
+#include "builtins.h"
+
+static void print_echo(struct string **args, int escapes, int newline, int i)
+{
+    while (args[i] != NULL)
+    {
+        if (escapes)
+        {
+            size_t j = 0;
+            while (j < args[i]->length)
+            {
+                if (args[i]->data[j] == '\\' && args[i]->data[j] != '\0')
+                {
+                    j += 1;
+                    switch (args[i]->data[j])
+                    {
+                    case 'n':
+                        putchar('\n');
+                        break;
+                    case 't':
+                        putchar('\t');
+                        break;
+                    case '\\':
+                        putchar('\\');
+                        break;
+                    default:
+                        putchar('\\');
+                        putchar(args[i]->data[j]);
+                        break;
+                    }
+                    j += 1;
+                }
+                else
+                {
+                    putchar(args[i]->data[j]);
+                    j += 1;
+                }
+            }
+        }
+        else
+        {
+            fputs(args[i]->data, stdout);
+        }
+        if (args[i + 1] != NULL)
+        {
+            putchar(' ');
+        }
+        i += 1;
+    }
+    if (newline)
+    {
+        putchar('\n');
+    }
+}
+
+int echo(struct string **args)
+{
+    int newline = 1;
+    int escapes = 0;
+    size_t i = 0;
+    if (args[0] == NULL)
+    {
+        putchar('\n');
+        return 0;
+    }
+    while (args[i] != NULL && args[i]->data[0] == '-')
+    {
+        if (args[i]->length == 2 && args[i]->data[1] == 'n')
+        {
+            newline = 0;
+            i += 1;
+        }
+        else if (args[i]->length == 2 && args[i]->data[1] == 'e')
+        {
+            escapes = 1;
+            i += 1;
+        }
+        else if (args[i]->length == 2 && args[i]->data[1] == 'E')
+        {
+            escapes = 0;
+            i += 1;
+        }
+        else
+        {
+            break;
+        }
+    }
+    print_echo(args, escapes, newline, i);
+    fflush(stdout);
+    return 0;
+}