image_*(), text_*(), sgr(): Add error() output

3 files changed, 16 insertions, 0 deletions

diff --git a/src/image.c b/src/image.c
index 59716da..47bc94c 100644
--- a/src/image.c
+++ b/src/image.c
@@ -28,6 +28,7 @@
 
 #include "font.h"
 #include "i18n.h"
+#include "output.h"
 #include "text.h"
 
 struct image {
@@ -43,6 +44,7 @@ image_new(const char *file_name)
 
 	image = calloc(1, sizeof(*image));
 	if (!image) {
+		error(_("Cannot allocate memory for image object"));
 		return NULL;
 	}
 
@@ -57,11 +59,13 @@ image_new(const char *file_name)
 	image->png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING,
 			NULL, NULL, NULL);
 	if (!image->png_ptr) {
+		error(_("Failed to create PNG structure"));
 		return image_destroy(&image);
 	}
 
 	image->info_ptr = png_create_info_struct(image->png_ptr);
 	if (!image->info_ptr) {
+		error(_("Failed to create PNG info structure"));
 		return image_destroy(&image);
 	}
 
diff --git a/src/sgr.c b/src/sgr.c
index 9faa117..4017b72 100644
--- a/src/sgr.c
+++ b/src/sgr.c
@@ -26,6 +26,9 @@
 
 #include <png.h>
 
+#include "i18n.h"
+#include "output.h"
+
 static png_color _4bit[] = {
 	{  0,   0,   0},  /* Black */
 	{170,   0,   0},  /* Red */
@@ -87,6 +90,7 @@ sgr(unsigned char *param, png_colorp fg, png_colorp bg)
 			}
 			p = param + 1;
 		} else if (*param < '0' || *param > '9') {
+			error(_("Invalid SGR parameter \"%s\""), p);
 			break;
 		}
 	}
diff --git a/src/text.c b/src/text.c
index 995d10e..f5ddaba 100644
--- a/src/text.c
+++ b/src/text.c
@@ -28,6 +28,8 @@
 #include <png.h>
 
 #include "font.h"
+#include "i18n.h"
+#include "output.h"
 #include "sgr.h"
 
 #define MAX(a, b) (((a) > (b)) ? (a) : (b))
@@ -70,6 +72,7 @@ text_new(FILE *stream)
 	}
 	text = calloc(1, sizeof(*text));
 	if (!text) {
+		error(_("Cannot allocate memory for text object"));
 		return NULL;
 	}
 
@@ -83,6 +86,10 @@ text_new(FILE *stream)
 			for (; c >= 0x20 && c <= 0x2F; _getc(text, stream, &c));
 			if (c >= 0x40 && c <= 0x7E) {
 				_getc(text, stream, &c);
+			} else {
+				error(_("Invalid control sequence at line %lu "
+							"column %lu"),
+						text->height + 1, width + 1);
 			}
 			eol = 0;
 		} else if (c == '\n') {
@@ -142,6 +149,7 @@ text_render(const struct text *text, const struct font *font, png_bytepp rows)
 	string_start = calloc(strlen((char *) text->string) + 1,
 			sizeof(*text->string));
 	if (!string_start) {
+		error(_("Cannot allocate memory for text rendering"));
 		return;
 	}
 	memcpy(string_start, text->string, strlen((char *) text->string) + 1);