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text editor: Return pointer to buffer but position in buffer for ACTION_GET to simpify code.

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Use strlcpy instead of strcpy to prevent buffer overflow.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@23845 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Teruaki Kawashima 2009-12-04 12:53:14 +00:00
parent 31f2981d99
commit cc9e336fa1
1 changed files with 26 additions and 28 deletions
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54
apps/plugins/text_editor.c
View file

@ -41,13 +41,13 @@ static int last_char_index = 0;
#define ACTION_UPDATE 3 #define ACTION_UPDATE 3
#define ACTION_CONCAT 4 #define ACTION_CONCAT 4
int _do_action(int action, char* str, int line); char* _do_action(int action, char* str, int line);
#ifndef HAVE_ADJUSTABLE_CPU_FREQ #ifndef HAVE_ADJUSTABLE_CPU_FREQ
#define do_action _do_action #define do_action _do_action
#else #else
int do_action(int action, char* str, int line) char* do_action(int action, char* str, int line)
{ {
int r; char *r;
rb->cpu_boost(1); rb->cpu_boost(1);
r = _do_action(action,str,line); r = _do_action(action,str,line);
rb->cpu_boost(0); rb->cpu_boost(0);
@ -55,7 +55,7 @@ int do_action(int action, char* str, int line)
} }
#endif #endif
int _do_action(int action, char* str, int line) char* _do_action(int action, char* str, int line)
{ {
int len, lennew; int len, lennew;
int i=0,c=0; int i=0,c=0;
@ -74,7 +74,7 @@ int _do_action(int action, char* str, int line)
case ACTION_INSERT: case ACTION_INSERT:
len = rb->strlen(str)+1; len = rb->strlen(str)+1;
if ( char_count+ len > MAX_CHARS ) if ( char_count+ len > MAX_CHARS )
return 0; return NULL;
rb->memmove(&buffer[c+len],&buffer[c],char_count-c); rb->memmove(&buffer[c+len],&buffer[c],char_count-c);
rb->strcpy(&buffer[c],str); rb->strcpy(&buffer[c],str);
char_count += len; char_count += len;
@ -82,10 +82,7 @@ int _do_action(int action, char* str, int line)
break; break;
case ACTION_GET: case ACTION_GET:
if (line > line_count) if (line > line_count)
return 0; return &buffer[0];
last_action_line = i;
last_char_index = c;
return c;
break; break;
case ACTION_REMOVE: case ACTION_REMOVE:
if (line > line_count) if (line > line_count)
@ -97,34 +94,34 @@ int _do_action(int action, char* str, int line)
break; break;
case ACTION_UPDATE: case ACTION_UPDATE:
if (line > line_count) if (line > line_count)
return 0; return NULL;
len = rb->strlen(&buffer[c])+1; len = rb->strlen(&buffer[c])+1;
lennew = rb->strlen(str)+1; lennew = rb->strlen(str)+1;
if ( char_count+ lennew-len > MAX_CHARS ) if ( char_count+ lennew-len > MAX_CHARS )
return 0; return NULL;
rb->memmove(&buffer[c+lennew],&buffer[c+len],char_count-c-len); rb->memmove(&buffer[c+lennew],&buffer[c+len],char_count-c-len);
rb->strcpy(&buffer[c],str); rb->strcpy(&buffer[c],str);
char_count += lennew-len; char_count += lennew-len;
break; break;
case ACTION_CONCAT: case ACTION_CONCAT:
if (line > line_count) if (line > line_count)
return 0; return NULL;
rb->memmove(&buffer[c-1],&buffer[c],char_count-c); rb->memmove(&buffer[c-1],&buffer[c],char_count-c);
char_count--; char_count--;
line_count--; line_count--;
break; break;
default: default:
return 0; return NULL;
} }
last_action_line = i; last_action_line = i;
last_char_index = c; last_char_index = c;
return 1; return &buffer[c];
} }
static const char* list_get_name_cb(int selected_item, void* data, static const char* list_get_name_cb(int selected_item, void* data,
char* buf, size_t buf_len) char* buf, size_t buf_len)
{ {
(void)data; (void)data;
char *b = &buffer[do_action(ACTION_GET,0,selected_item)]; char *b = do_action(ACTION_GET, 0, selected_item);
/* strlcpy(dst, src, siz) returns strlen(src) */ /* strlcpy(dst, src, siz) returns strlen(src) */
if (rb->strlcpy(buf, b, buf_len) >= buf_len) if (rb->strlcpy(buf, b, buf_len) >= buf_len)
{ {
@ -201,7 +198,7 @@ bool save_changes(int overwrite)
#endif #endif
for (i=0;i<line_count;i++) for (i=0;i<line_count;i++)
{ {
rb->fdprintf(fd,"%s%s",&buffer[do_action(ACTION_GET,0,i)],eol); rb->fdprintf(fd,"%s%s", do_action(ACTION_GET, 0, i), eol);
} }
#ifdef HAVE_ADJUSTABLE_CPU_FREQ #ifdef HAVE_ADJUSTABLE_CPU_FREQ
rb->cpu_boost(0); rb->cpu_boost(0);
@ -238,12 +235,14 @@ int do_item_menu(int cur_sel, char* copy_buffer)
switch (rb->do_menu(&menu, NULL, NULL, false)) switch (rb->do_menu(&menu, NULL, NULL, false))
{ {
case 0: /* cut */ case 0: /* cut */
rb->strcpy(copy_buffer,&buffer[do_action(ACTION_GET,0,cur_sel)]); rb->strlcpy(copy_buffer, do_action(ACTION_GET, 0, cur_sel),
do_action(ACTION_REMOVE,0,cur_sel); MAX_LINE_LEN);
do_action(ACTION_REMOVE, 0, cur_sel);
ret = MENU_RET_UPDATE; ret = MENU_RET_UPDATE;
break; break;
case 1: /* copy */ case 1: /* copy */
rb->strcpy(copy_buffer,&buffer[do_action(ACTION_GET,0,cur_sel)]); rb->strlcpy(copy_buffer, do_action(ACTION_GET, 0, cur_sel),
MAX_LINE_LEN);
ret = MENU_RET_NO_UPDATE; ret = MENU_RET_NO_UPDATE;
break; break;
case 2: /* insert above */ case 2: /* insert above */
@ -346,12 +345,12 @@ enum plugin_status plugin_start(const void* parameter)
#ifdef HAVE_LCD_COLOR #ifdef HAVE_LCD_COLOR
char *c = NULL; char *c = NULL;
#endif #endif
rb->strcpy(filename,(char*)parameter); rb->strlcpy(filename, (char*)parameter, MAX_PATH);
get_eol_string(filename); get_eol_string(filename);
fd = rb->open(filename,O_RDONLY); fd = rb->open(filename,O_RDONLY);
if (fd<0) if (fd<0)
{ {
rb->splashf(HZ*2,"Couldnt open file: %s",(char*)parameter); rb->splashf(HZ*2, "Couldnt open file: %s", filename);
return PLUGIN_ERROR; return PLUGIN_ERROR;
} }
#ifdef HAVE_LCD_COLOR #ifdef HAVE_LCD_COLOR
@ -397,14 +396,15 @@ enum plugin_status plugin_start(const void* parameter)
case ACTION_STD_OK: case ACTION_STD_OK:
{ {
if (line_count) if (line_count)
rb->strcpy(temp_line,&buffer[do_action(ACTION_GET,0,cur_sel)]); rb->strlcpy(temp_line, do_action(ACTION_GET, 0, cur_sel),
MAX_LINE_LEN);
#ifdef HAVE_LCD_COLOR #ifdef HAVE_LCD_COLOR
if (edit_colors_file && line_count) if (edit_colors_file && line_count)
{ {
char *name = temp_line, *value = NULL; char *name = temp_line, *value = NULL;
char extension[MAX_LINE_LEN]; char extension[MAX_LINE_LEN];
int color, old_color; int color, old_color;
bool temp_changed; bool temp_changed = false;
rb->settings_parseline(temp_line, &name, &value); rb->settings_parseline(temp_line, &name, &value);
if (line_count) if (line_count)
{ {
@ -426,9 +426,6 @@ enum plugin_status plugin_start(const void* parameter)
rb->set_color(rb->screens[SCREEN_MAIN], name, &color, -1); rb->set_color(rb->screens[SCREEN_MAIN], name, &color, -1);
temp_changed = (value == NULL) || (color != old_color); temp_changed = (value == NULL) || (color != old_color);
break; break;
default:
/* Should never happen but makes compiler happy */
temp_changed = false;
} }
if (temp_changed) if (temp_changed)
@ -456,8 +453,9 @@ enum plugin_status plugin_start(const void* parameter)
break; break;
case ACTION_STD_CONTEXT: case ACTION_STD_CONTEXT:
if (!line_count) break; if (!line_count) break;
rb->strcpy(copy_buffer,&buffer[do_action(ACTION_GET,0,cur_sel)]); rb->strlcpy(copy_buffer, do_action(ACTION_GET, 0, cur_sel),
do_action(ACTION_REMOVE,0,cur_sel); MAX_LINE_LEN);
do_action(ACTION_REMOVE, 0, cur_sel);
changed = true; changed = true;
break; break;
case ACTION_STD_MENU: case ACTION_STD_MENU: