From 0b9687372282752f586af875f688d634648a5fda Mon Sep 17 00:00:00 2001
From: Patrick McDermott <patrick.mcdermott@libiquity.com>
Date: Thu, 18 Jul 2019 02:28:03 -0400
Subject: text_new(): Read a file stream

text_render() must now consume the CSI "[" in the if condition, as
text_new() does.
---
diff --git a/src/main.c b/src/main.c
index d16197a..86c2f95 100644
--- a/src/main.c
+++ b/src/main.c
@@ -19,7 +19,10 @@
  * along with fbcon2png.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <stdio.h>
+
 #include "font.h"
+#include "i18n.h"
 #include "image.h"
 #include "text.h"
 
@@ -27,6 +30,7 @@ int
 main(int argc, char **argv)
 {
 	struct font  *font;
+	FILE         *fp;
 	struct text  *text;
 	struct image *image;
 
@@ -35,7 +39,20 @@ main(int argc, char **argv)
 	}
 
 	font = font_find(argv[1]);
-	text = text_new(argv[2]);
+	if (strcmp(argv[2], "-") != 0) {
+		fp = fopen(argv[2], "r");
+		if (!fp) {
+			printf(_("Error: Cannot open \"%s\" for reading\n"),
+					argv[2]);
+			return 1;
+		}
+	} else {
+		fp = stdin;
+	}
+	text = text_new(fp);
+	if (fp != stdin) {
+		fclose(fp);
+	}
 	text_set_width(text, 80);
 	text_set_height(text, 25);
 	image = image_new(argv[3]);
diff --git a/src/text.c b/src/text.c
index dea3259..dda6de1 100644
--- a/src/text.c
+++ b/src/text.c
@@ -21,6 +21,7 @@
 
 #include "text.h"
 
+#include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 
@@ -32,19 +33,39 @@
 #define MAX(a, b) (((a) > (b)) ? (a) : (b))
 
 struct text {
-	const char *string;
-	size_t      width;
-	size_t      height;
+	size_t  size;
+	size_t  read;
+	char   *string;
+	size_t  width;
+	size_t  height;
 };
 
+static char
+_getc(struct text *text, FILE *stream, char *c)
+{
+	int i_c;
+
+	if (text->read == text->size) {
+		text->size += 8192;
+		text->string = realloc(text->string, text->size);
+	}
+
+	i_c = fgetc(stream);
+	if (i_c == EOF) {
+		i_c = 0;
+	}
+	return text->string[text->read++] = *c = i_c;
+}
+
 struct text *
-text_new(const char *string)
+text_new(FILE *stream)
 {
 	struct text *text;
 	size_t       width;
 	int          eol;
+	char         c;
 
-	if (!string) {
+	if (!stream) {
 		return NULL;
 	}
 	text = calloc(1, sizeof(*text));
@@ -52,28 +73,27 @@ text_new(const char *string)
 		return NULL;
 	}
 
-	text->string = string;
-
 	width = 0;
 	eol = 0;
-	while (string && *string) {
-		if (*string == 0x1B && *(string + 1) == '[') {  /* CSI */
-			string += 2;
-			for (; *string >= 0x30 && *string <= 0x3F; ++string);
-			for (; *string >= 0x20 && *string <= 0x2F; ++string);
-			if (*string >= 0x40 && *string <= 0x7E) {
-				++string;
+	_getc(text, stream, &c);
+	while (c) {
+		if (c == 0x1B && _getc(text, stream, &c) == '[') {  /* CSI */
+			_getc(text, stream, &c);
+			for (; c >= 0x30 && c <= 0x3F; _getc(text, stream, &c));
+			for (; c >= 0x20 && c <= 0x2F; _getc(text, stream, &c));
+			if (c >= 0x40 && c <= 0x7E) {
+				_getc(text, stream, &c);
 			}
 			eol = 0;
-		} else if (*string == '\n') {
+		} else if (c == '\n') {
 			text->width = MAX(text->width, width);
 			width = 0;
 			++text->height;
-			++string;
+			_getc(text, stream, &c);
 			eol = 1;
 		} else {
 			++width;
-			++string;
+			_getc(text, stream, &c);
 			eol = 0;
 		}
 	}
@@ -129,8 +149,8 @@ text_render(struct text *text, struct font *font, png_bytepp rows)
 	row = 0;
 	col = 0;
 	while (string && *string) {
-		if (*string == 0x1B && *(string + 1) == '[') {  /* CSI */
-			string += 2;
+		if (*string == 0x1B && *(++string) == '[') {  /* CSI */
+			++string;
 			parameter = string;
 			for (; *string >= 0x30 && *string <= 0x3F; ++string);
 			for (; *string >= 0x20 && *string <= 0x2F; ++string);
@@ -171,6 +191,7 @@ text_destroy(struct text **text_p)
 
 	text = *text_p;
 
+	free(text->string);
 	free(text);
 	return text = NULL;
 }
diff --git a/src/text.h b/src/text.h
index 9c581d6..8ee0245 100644
--- a/src/text.h
+++ b/src/text.h
@@ -22,6 +22,8 @@
 #ifndef TEXT_H
 #define TEXT_H
 
+#include <stdio.h>
+
 #include <png.h>
 
 #include "font.h"
@@ -29,7 +31,7 @@
 struct text;
 
 struct text *
-text_new(const char *string);
+text_new(FILE *stream);
 
 size_t
 text_get_width(struct text *text) __attribute__((pure));
--
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