From 2d78f416428c80738d5d9fa045863c6501f20f2a Mon Sep 17 00:00:00 2001
From: Edgar Simo <bobbens@gmail.com>
Date: Thu, 3 Jul 2008 21:03:25 +0000
Subject: [PATCH] Using errno for more verbosity in errors.

---
 src/haptic/linux/SDL_syshaptic.c | 25 ++++++++++++++-----------
 1 file changed, 14 insertions(+), 11 deletions(-)

diff --git a/src/haptic/linux/SDL_syshaptic.c b/src/haptic/linux/SDL_syshaptic.c
index 35e4b2dc1..7cc200106 100644
--- a/src/haptic/linux/SDL_syshaptic.c
+++ b/src/haptic/linux/SDL_syshaptic.c
@@ -37,6 +37,7 @@
 #include <fcntl.h>
 #include <linux/limits.h>
 #include <string.h>
+#include <errno.h>
 
 
 #define MAX_HAPTICS  32
@@ -88,7 +89,7 @@ EV_IsHaptic(int fd)
    ret = 0;
 
    if (ioctl(fd, EVIOCGBIT(EV_FF, sizeof(unsigned long) * 4), features) < 0) {
-      SDL_SetError("Unable to get device's haptic abilities.");
+      SDL_SetError("Unable to get device's haptic abilities: %s", strerror(errno));
       return -1;
    }
 
@@ -212,7 +213,7 @@ SDL_SYS_HapticOpenFromFD(SDL_Haptic * haptic, int fd)
 
    /* Set the effects */
    if (ioctl(fd, EVIOCGEFFECTS, &haptic->neffects) < 0) {
-      SDL_SetError("Unable to query haptic device memory.");
+      SDL_SetError("Unable to query haptic device memory: %s", strerror(errno));
       goto open_err;
    }
    haptic->effects = (struct haptic_effect *)
@@ -249,7 +250,8 @@ SDL_SYS_HapticOpen(SDL_Haptic * haptic)
    /* Open the character device */
    fd = open(SDL_hapticlist[haptic->index].fname, O_RDWR, 0);
    if (fd < 0) {
-      SDL_SetError("Unable to open %s\n", SDL_hapticlist[haptic->index]);
+      SDL_SetError("Unable to open %s: %s",
+            SDL_hapticlist[haptic->index], strerror(errno));
       return -1;
    }
    
@@ -477,7 +479,7 @@ SDL_SYS_ToFFEffect( struct ff_effect * dest, SDL_HapticEffect * src )
 
 
       default:
-         SDL_SetError("Unknown haptic effect type.");
+         SDL_SetError("Unknown haptic effect type");
          return -1;
    }
 
@@ -511,7 +513,7 @@ SDL_SYS_HapticNewEffect(SDL_Haptic * haptic, struct haptic_effect * effect,
 
    /* Upload the effect */
    if (ioctl(haptic->hwdata->fd, EVIOCSFF, linux_effect) < 0) {
-      SDL_SetError("Error uploading effect to the haptic device.");
+      SDL_SetError("Error uploading effect to the haptic device: %s", strerror(errno));
       goto new_effect_err;
    }
 
@@ -543,7 +545,7 @@ int SDL_SYS_HapticUpdateEffect(SDL_Haptic * haptic,
 
    /* See if it can be uploaded. */
    if (ioctl(haptic->hwdata->fd, EVIOCSFF, &linux_effect) < 0) {
-      SDL_SetError("Error updating the haptic effect.");
+      SDL_SetError("Error updating the haptic effect: %s", strerror(errno));
       return -1;
    }
 
@@ -568,7 +570,7 @@ SDL_SYS_HapticRunEffect(SDL_Haptic * haptic, struct haptic_effect * effect)
    run.value = 1;
 
    if (write(haptic->hwdata->fd, (const void*) &run, sizeof(run)) < 0) {
-      SDL_SetError("Unable to run the haptic effect.");
+      SDL_SetError("Unable to run the haptic effect: %s", strerror(errno));
       return -1;
    }
 
@@ -589,7 +591,7 @@ SDL_SYS_HapticStopEffect(SDL_Haptic * haptic, struct haptic_effect * effect)
    stop.value = 0;
 
    if (write(haptic->hwdata->fd, (const void*) &stop, sizeof(stop)) < 0) {
-      SDL_SetError("Unable to stop the haptic effect.");
+      SDL_SetError("Unable to stop the haptic effect: %s", strerror(errno));
       return -1;
    }
 
@@ -604,7 +606,8 @@ void
 SDL_SYS_HapticDestroyEffect(SDL_Haptic * haptic, struct haptic_effect * effect)
 {
    if (ioctl(haptic->hwdata->fd, EVIOCRMFF, effect->hweffect->effect.id) < 0) {
-      SDL_SetError("Error removing the effect from the haptic device.");
+      SDL_SetError("Error removing the effect from the haptic device: %s",
+            strerror(errno));
    }
    SDL_free(effect->hweffect);
    effect->hweffect = NULL;
@@ -649,7 +652,7 @@ SDL_SYS_HapticSetGain(SDL_Haptic * haptic, int gain)
    ie.value = (0xFFFFUL * gain) / 100;
 
    if (write(haptic->hwdata->fd, &ie, sizeof(ie)) < 0) {
-      SDL_SetError("Error setting gain.");
+      SDL_SetError("Error setting gain: %s", strerror(errno));
       return -1;
    }
 
@@ -670,7 +673,7 @@ SDL_SYS_HapticSetAutocenter(SDL_Haptic * haptic, int autocenter)
    ie.value = (0xFFFFUL * autocenter) / 100;
 
    if (write(haptic->hwdata->fd, &ie, sizeof(ie)) < 0) {
-      SDL_SetError("Error setting autocenter.");
+      SDL_SetError("Error setting autocenter: %s", strerror(errno));
       return -1;
    }