save commit

minishell-codex/src/parser/expand.c

@@ -0,0 +1,113 @@
+#include "minishell.h"
+
+static void buf_append(char **buf, size_t *len, size_t *cap, const char *s)
+{
+	size_t slen;
+	char *newbuf;
+
+	if (!s)
+		return;
+	slen = strlen(s);
+	if (*len + slen + 1 > *cap)
+	{
+		*cap = (*len + slen + 1) * 2;
+		newbuf = (char *)realloc(*buf, *cap);
+		if (!newbuf)
+			return;
+		*buf = newbuf;
+	}
+	memcpy(*buf + *len, s, slen);
+	*len += slen;
+	(*buf)[*len] = '\0';
+}
+
+static void buf_append_char(char **buf, size_t *len, size_t *cap, char c)
+{
+	char tmp[2];
+	tmp[0] = c;
+	tmp[1] = '\0';
+	buf_append(buf, len, cap, tmp);
+}
+
+static char *expand_word(const char *word, t_shell *sh)
+{
+	int in_single = 0;
+	int in_double = 0;
+	size_t i = 0;
+	char *out = NULL;
+	size_t len = 0, cap = 0;
+
+	while (word && word[i])
+	{
+		if (word[i] == '\'' && !in_double)
+		{
+			in_single = !in_single;
+			i++;
+			continue;
+		}
+		if (word[i] == '"' && !in_single)
+		{
+			in_double = !in_double;
+			i++;
+			continue;
+		}
+		if (word[i] == '$' && !in_single)
+		{
+			if (word[i + 1] == '?')
+			{
+				char *v = ms_itoa(sh->last_status);
+				buf_append(&out, &len, &cap, v);
+				free(v);
+				i += 2;
+				continue;
+			}
+			if (ms_is_alpha((unsigned char)word[i + 1]))
+			{
+				size_t j = i + 1;
+				while (word[j] && ms_is_alnum((unsigned char)word[j]))
+					j++;
+				char *name = ms_strndup(word + i + 1, j - (i + 1));
+				char *val = env_get(sh, name);
+				buf_append(&out, &len, &cap, val ? val : "");
+				free(name);
+				i = j;
+				continue;
+			}
+		}
+		buf_append_char(&out, &len, &cap, word[i]);
+		i++;
+	}
+	if (!out)
+		out = ms_strdup("");
+	return out;
+}
+
+int expand_pipeline(t_pipeline *p, t_shell *sh)
+{
+	size_t i;
+	int j;
+	for (i = 0; i < p->count; i++)
+	{
+		for (j = 0; p->cmds[i]->argv && p->cmds[i]->argv[j]; j++)
+		{
+			char *neww = expand_word(p->cmds[i]->argv[j], sh);
+			free(p->cmds[i]->argv[j]);
+			p->cmds[i]->argv[j] = neww;
+		}
+		if (p->cmds[i]->redirs)
+		{
+			t_redir *r = p->cmds[i]->redirs;
+			while (r)
+			{
+				if (r->target)
+				{
+					char *nt = expand_word(r->target, sh);
+					free(r->target);
+					r->target = nt;
+				}
+				r = r->next;
+			}
+		}
+	}
+	return 0;
+}