Source / Include Folder (#88)

Moved Source Files Into `src` Folder

1 files changed, 220 insertions, 0 deletions

diff --git a/src/dstring.c b/src/dstring.c
new file mode 100644
index 0000000..f344d09
--- /dev/null
+++ b/src/dstring.c
@@ -0,0 +1,220 @@
+/****************************************************************************
+ * bfs                                                                      *
+ * Copyright (C) 2016-2022 Tavian Barnes <tavianator@tavianator.com>        *
+ *                                                                          *
+ * Permission to use, copy, modify, and/or distribute this software for any *
+ * purpose with or without fee is hereby granted.                           *
+ *                                                                          *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES *
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF         *
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR  *
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES   *
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN    *
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF  *
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.           *
+ ****************************************************************************/
+
+#include "dstring.h"
+#include <assert.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+/**
+ * The memory representation of a dynamic string.  Users get a pointer to data.
+ */
+struct dstring {
+	size_t capacity;
+	size_t length;
+	char data[];
+};
+
+/** Get the string header from the string data pointer. */
+static struct dstring *dstrheader(const char *dstr) {
+	return (struct dstring *)(dstr - offsetof(struct dstring, data));
+}
+
+/** Get the correct size for a dstring with the given capacity. */
+static size_t dstrsize(size_t capacity) {
+	return BFS_FLEX_SIZEOF(struct dstring, data, capacity + 1);
+}
+
+/** Allocate a dstring with the given contents. */
+static char *dstralloc_impl(size_t capacity, size_t length, const char *data) {
+	// Avoid reallocations for small strings
+	if (capacity < 7) {
+		capacity = 7;
+	}
+
+	struct dstring *header = malloc(dstrsize(capacity));
+	if (!header) {
+		return NULL;
+	}
+
+	header->capacity = capacity;
+	header->length = length;
+
+	memcpy(header->data, data, length);
+	header->data[length] = '\0';
+	return header->data;
+}
+
+char *dstralloc(size_t capacity) {
+	return dstralloc_impl(capacity, 0, "");
+}
+
+char *dstrdup(const char *str) {
+	size_t len = strlen(str);
+	return dstralloc_impl(len, len, str);
+}
+
+char *dstrndup(const char *str, size_t n) {
+	size_t len = strnlen(str, n);
+	return dstralloc_impl(len, len, str);
+}
+
+size_t dstrlen(const char *dstr) {
+	return dstrheader(dstr)->length;
+}
+
+int dstreserve(char **dstr, size_t capacity) {
+	struct dstring *header = dstrheader(*dstr);
+
+	if (capacity > header->capacity) {
+		capacity *= 2;
+
+		header = realloc(header, dstrsize(capacity));
+		if (!header) {
+			return -1;
+		}
+		header->capacity = capacity;
+
+		*dstr = header->data;
+	}
+
+	return 0;
+}
+
+int dstresize(char **dstr, size_t length) {
+	if (dstreserve(dstr, length) != 0) {
+		return -1;
+	}
+
+	struct dstring *header = dstrheader(*dstr);
+	header->length = length;
+	header->data[length] = '\0';
+
+	return 0;
+}
+
+/** Common implementation of dstr{cat,ncat,app}. */
+static int dstrcat_impl(char **dest, const char *src, size_t srclen) {
+	size_t oldlen = dstrlen(*dest);
+	size_t newlen = oldlen + srclen;
+
+	if (dstresize(dest, newlen) != 0) {
+		return -1;
+	}
+
+	memcpy(*dest + oldlen, src, srclen);
+	return 0;
+}
+
+int dstrcat(char **dest, const char *src) {
+	return dstrcat_impl(dest, src, strlen(src));
+}
+
+int dstrncat(char **dest, const char *src, size_t n) {
+	return dstrcat_impl(dest, src, strnlen(src, n));
+}
+
+int dstrdcat(char **dest, const char *src) {
+	return dstrcat_impl(dest, src, dstrlen(src));
+}
+
+int dstrapp(char **str, char c) {
+	return dstrcat_impl(str, &c, 1);
+}
+
+char *dstrprintf(const char *format, ...) {
+	va_list args;
+
+	va_start(args, format);
+	char *str = dstrvprintf(format, args);
+	va_end(args);
+
+	return str;
+}
+
+char *dstrvprintf(const char *format, va_list args) {
+	// Guess a capacity to try to avoid reallocating
+	char *str = dstralloc(2*strlen(format));
+	if (!str) {
+		return NULL;
+	}
+
+	if (dstrvcatf(&str, format, args) != 0) {
+		dstrfree(str);
+		return NULL;
+	}
+
+	return str;
+}
+
+int dstrcatf(char **str, const char *format, ...) {
+	va_list args;
+
+	va_start(args, format);
+	int ret = dstrvcatf(str, format, args);
+	va_end(args);
+
+	return ret;
+}
+
+int dstrvcatf(char **str, const char *format, va_list args) {
+	// Guess a capacity to try to avoid calling vsnprintf() twice
+	size_t len = dstrlen(*str);
+	dstreserve(str, len + 2*strlen(format));
+	size_t cap = dstrheader(*str)->capacity;
+
+	va_list copy;
+	va_copy(copy, args);
+
+	char *tail = *str + len;
+	int ret = vsnprintf(tail, cap - len + 1, format, args);
+	if (ret < 0) {
+		goto fail;
+	}
+
+	size_t tail_len = ret;
+	if (tail_len > cap - len) {
+		cap = len + tail_len;
+		if (dstreserve(str, cap) != 0) {
+			goto fail;
+		}
+
+		tail = *str + len;
+		ret = vsnprintf(tail, tail_len + 1, format, copy);
+		if (ret < 0 || (size_t)ret != tail_len) {
+			assert(!"Length of formatted string changed");
+			goto fail;
+		}
+	}
+
+	va_end(copy);
+
+	struct dstring *header = dstrheader(*str);
+	header->length += tail_len;
+	return 0;
+
+fail:
+	*tail = '\0';
+	return -1;
+}
+
+void dstrfree(char *dstr) {
+	if (dstr) {
+		free(dstrheader(dstr));
+	}
+}