save commit

minishell-codex/src/utils/str_utils.c

@@ -0,0 +1,100 @@
+#include "minishell.h"
+
+char *ms_strdup(const char *s)
+{
+	char *out;
+	size_t len;
+
+	if (!s)
+		return NULL;
+	len = strlen(s);
+	out = (char *)malloc(len + 1);
+	if (!out)
+		return NULL;
+	memcpy(out, s, len);
+	out[len] = '\0';
+	return out;
+}
+
+char *ms_strndup(const char *s, size_t n)
+{
+	char *out;
+	if (!s)
+		return NULL;
+	out = (char *)malloc(n + 1);
+	if (!out)
+		return NULL;
+	memcpy(out, s, n);
+	out[n] = '\0';
+	return out;
+}
+
+char *ms_substr(const char *s, size_t start, size_t len)
+{
+	size_t slen;
+	if (!s)
+		return NULL;
+	slen = strlen(s);
+	if (start >= slen)
+		return ms_strdup("");
+	if (start + len > slen)
+		len = slen - start;
+	return ms_strndup(s + start, len);
+}
+
+char *ms_strjoin(const char *a, const char *b)
+{
+	size_t la;
+	size_t lb;
+	char *out;
+
+	if (!a || !b)
+		return NULL;
+	la = strlen(a);
+	lb = strlen(b);
+	out = (char *)malloc(la + lb + 1);
+	if (!out)
+		return NULL;
+	memcpy(out, a, la);
+	memcpy(out + la, b, lb);
+	out[la + lb] = '\0';
+	return out;
+}
+
+char *ms_strjoin3(const char *a, const char *b, const char *c)
+{
+	char *ab;
+	char *abc;
+
+	ab = ms_strjoin(a, b);
+	if (!ab)
+		return NULL;
+	abc = ms_strjoin(ab, c);
+	free(ab);
+	return abc;
+}
+
+char *ms_itoa(int n)
+{
+	char buf[32];
+	int i;
+	int neg;
+	long nb;
+
+	nb = n;
+	neg = (nb < 0);
+	if (neg)
+		nb = -nb;
+	i = 30;
+	buf[31] = '\0';
+	if (nb == 0)
+		buf[i--] = '0';
+	while (nb > 0)
+	{
+		buf[i--] = (char)('0' + (nb % 10));
+		nb /= 10;
+	}
+	if (neg)
+		buf[i--] = '-';
+	return ms_strdup(&buf[i + 1]);
+}