Custom file struct

src/ncdgfile.c

@@ -0,0 +1,75 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <strings.h>
+#include <ncdgfile.h>
+
+static int fileputc(struct ncdgfile *file, int c);
+static int fileputs(struct ncdgfile *file, char *s);
+static void filefree(struct ncdgfile *file);
+
+static int stringputc(struct ncdgfile *file, int c);
+static int stringputs(struct ncdgfile *file, char *s);
+static void stringfree(struct ncdgfile *file);
+
+struct ncdgfile *file2ncdg(FILE *file) {
+	struct ncdgfile *ret;
+	if ((ret = malloc(sizeof *ret)) == NULL) {
+		return NULL;
+	}
+	ret->putc = fileputc;
+	ret->puts = fileputs;
+	ret->free = filefree;
+	ret->handle = (void *) file;
+	return ret;
+}
+
+struct ncdgfile *stringfile(void) {
+	struct ncdgfile *ret;
+	if ((ret = malloc(sizeof *ret)) == NULL) {
+		goto error1;
+	}
+	if ((ret->handle = (void *) newstring()) == NULL) {
+		goto error2;
+	}
+	ret->putc = stringputc;
+	ret->puts = stringputs;
+	ret->free = stringfree;
+	return ret;
+error2:
+	free(ret);
+error1:
+	return NULL;
+}
+
+static int fileputc(struct ncdgfile *file, int c) {
+	return fputc(c, (FILE *) file->handle) == EOF ? -1 : 0;
+}
+
+static int fileputs(struct ncdgfile *file, char *s) {
+	return fputs(s, (FILE *) file->handle) == EOF ? -1 : 0;
+}
+
+static void filefree(struct ncdgfile *file) {
+	fclose((FILE *) file->handle);
+	free(file);
+}
+
+static int stringputc(struct ncdgfile *file, int c) {
+	return appendchar((struct string *) file->handle, c) ? -1 : 0;
+}
+
+static int stringputs(struct ncdgfile *file, char *s) {
+	long i;
+	for (i = 0; s[i] != '\0'; ++i) {
+		if (appendchar((struct string *) file->handle, s[i])) {
+			return -1;
+		}
+	}
+	return 0;
+}
+
+static void stringfree(struct ncdgfile *file) {
+	freestring((struct string *) file->handle);
+	free(file);
+}