Add basic readline

ecsls.toml

@@ -1 +1,2 @@
- 
+[reports]
+merge = "multiplier"

src/readline.c

@@ -0,0 +1,132 @@
+/*
+** EPITECH PROJECT, 2025
+** __
+** File description:
+** _
+*/
+
+#include <ctype.h>
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "common.h"
+#include "debug.h"
+#include "readline.h"
+#include "u_str.h"
+
+static
+size_t strcpy_printable(char *dest, char const *src, size_t n)
+{
+    size_t count = 0;
+
+    for (size_t i = 0; i < n; i++) {
+        if (isprint(src[i])) {
+            *dest = src[i];
+            count++;
+            dest++;
+        }
+    }
+    return count;
+}
+
+static
+bool str_printable(char const *str, size_t size)
+{
+    for (size_t i = 0; i < size; i++)
+        if (!isprint(str[i]))
+            return false;
+    return true;
+}
+
+static
+bool ensure_buff_av_capacity(buff_t *buff, size_t requested)
+{
+    char *new_str;
+    size_t endsize = BUFF_INIT_SZ;
+
+    if ((buff->sz + requested) < buff->cap)
+        return true;
+    for (; endsize < buff->sz + requested; endsize <<= 1);
+    if (endsize > buff->cap) {
+        new_str = realloc(buff->str, (sizeof *buff->str) * endsize);
+        if (new_str == NULL)
+            return false;
+        buff->str = new_str;
+        buff->cap = endsize;
+    }
+    return true;
+}
+
+static
+bool ensure_buff_capacity(buff_t *buff)
+{
+    char *new_str;
+
+    if (buff->str == NULL) {
+        new_str = malloc((sizeof *buff->str) * BUFF_INIT_SZ);
+        if (new_str == NULL)
+            return false;
+        buff->str = new_str;
+        buff->cap = BUFF_INIT_SZ;
+    }
+    if (buff->sz == buff->cap) {
+        new_str = realloc(buff->str, (sizeof *buff->str) * buff->cap << 1);
+        if (new_str == NULL)
+            return false;
+        buff->str = new_str;
+        buff->cap <<= 1;
+    }
+    return true;
+}
+
+static
+bool append_null_terminator(buff_t *buff)
+{
+    if (!ensure_buff_av_capacity(buff, 1))
+        return false;
+    buff->str[buff->sz] = '\0';
+    buff->sz++;
+    return true;
+}
+
+static
+int8_t handle_line_buff(buff_t *buff, char *read_buff, ssize_t read_size)
+{
+    if (*read_buff == CTRL('d')) {
+        buff->sz = 0;
+        return WRITE_CONST(STDOUT_FILENO, "exit\n"), RETURN_SUCCESS;
+    }
+    if (str_printable(read_buff, read_size))
+        write(STDOUT_FILENO, read_buff, read_size);
+    if (!ensure_buff_av_capacity(buff, read_size))
+        return RETURN_FAILURE;
+    buff->sz += strcpy_printable(buff->str + buff->sz,
+        read_buff, read_size);
+    return -1;
+}
+
+bool readline(buff_t *buff)
+{
+    char read_buff[32] = "";
+    ssize_t read_size = 0;
+
+    if (!ensure_buff_capacity(buff))
+        return false;
+    while (*read_buff != '\n' && *read_buff != '\r') {
+        memset(read_buff, '\0', sizeof read_buff);
+        read_size = read(STDIN_FILENO, &read_buff, sizeof read_buff - 1);
+        if (read_size < 0)
+            return false;
+        if (read_size == 0) {
+            buff->sz = 0;
+            return true;
+        }
+        if (handle_line_buff(buff, read_buff, read_size) > -1)
+            return true;
+    }
+    U_DEBUG("buff count: %zu\n", buff->sz);
+    return append_null_terminator(buff);
+}

src/readline.h

@@ -0,0 +1,17 @@
+/*
+** EPITECH PROJECT, 2025
+** __
+** File description:
+** _
+*/
+
+#ifndef READLINE
+    #define READLINE
+    #define CTRL(x) (x & 0xf)
+    #define BUFF_INIT_SZ 128
+    #include <stdbool.h>
+
+    #include "u_str.h"
+
+bool readline(buff_t *buff);
+#endif /* READLINE */

src/shell.c

@@ -16,6 +16,7 @@
 #include "debug.h"
 #include "env.h"
 #include "history.h"
+#include "readline.h"
 #include "shell.h"
 #include "u_str.h"
 
@@ -56,22 +57,20 @@ void write_prompt(int is_a_tty)
 }
 
 static
-bool change_shell_command(char **buffer, exec_ctx_t *exec_ctx,
-    size_t buffer_sz)
+bool change_shell_command(buff_t *buff, exec_ctx_t *exec_ctx)
 {
-    size_t buffer_len = 0;
     char *tmp_buff = NULL;
 
-    if (getline(buffer, &buffer_sz, stdin) == -1)
+    if (!readline(buff))
         return true;
-    tmp_buff = (*buffer);
-    buffer_len = update_command(&tmp_buff, &buffer_sz, exec_ctx);
-    if (buffer_len < 1 || !u_str_is_alnum(tmp_buff)) {
+    tmp_buff = buff->str;
+    buff->sz = update_command(&tmp_buff, &buff->sz, exec_ctx);
+    if (buff->sz < 1 || !u_str_is_alnum(tmp_buff)) {
         check_basic_error(tmp_buff);
         free(tmp_buff);
         return false;
     }
-    U_DEBUG("Buffer [%lu] [%s]\n", buffer_len, buffer);
+    U_DEBUG("Buffer [%lu] [%s]\n", buff->sz, buff->str);
     visitor(tmp_buff, exec_ctx);
     free(tmp_buff);
     return false;
@@ -80,16 +79,15 @@ bool change_shell_command(char **buffer, exec_ctx_t *exec_ctx,
 static
 int shell_loop(int is_a_tty, exec_ctx_t *exec_ctx)
 {
-    char *buffer = NULL;
-    size_t buffer_sz = 0;
+    buff_t buff = { .str = NULL, 0 };
 
     while (true) {
         write_prompt(is_a_tty);
-        if (change_shell_command(&buffer, exec_ctx, buffer_sz) == true)
+        if (change_shell_command(&buff, exec_ctx))
             return exec_ctx->history->last_exit_code;
     }
     free(exec_ctx->history_command);
-    return (free(buffer), exec_ctx->history->last_exit_code);
+    return free(buff.str), exec_ctx->history->last_exit_code;
 }
 
 his_command_t *init_cmd_history(void)