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-rw-r--r--src/scrotty.c81
1 files changed, 57 insertions, 24 deletions
diff --git a/src/scrotty.c b/src/scrotty.c
index 850e448..d62abb1 100644
--- a/src/scrotty.c
+++ b/src/scrotty.c
@@ -66,33 +66,22 @@ static const char* inttable[] =
*
* @param fbname The framebuffer device
* @param fbno The number of the framebuffer
+ * @param width The width of the image
+ * @param height The height of the image
* @param fd The file descriptor connected to `convert`'s stdin
* @return Zero on success, -1 on error
*/
-static int save_pnm(const char* fbpath, int fbno, int fd)
+static int save_pnm(const char* fbpath, int fbno, long width, long height, int fd)
{
char buf[PATH_MAX];
FILE* file;
- int saved_errno, sizefd, fbfd, r, g, b;
+ int saved_errno, fbfd, r, g, b;
ssize_t got, off;
- /* Open the file with the framebuffer's dimensions. */
- sprintf(buf, SYSDIR "/class/graphics/fb%i/virtual_size", fbno);
- if (sizefd = open(buf, O_RDONLY), sizefd < 0)
- return -1;
-
- /* Get the dimensions of the framebuffer. */
- if (got = read(sizefd, buf, sizeof(buf) / sizeof(char) - 1), got < 0)
- return saved_errno = errno, close(sizefd), errno = saved_errno, -1;
- close(sizefd);
- /* The read content is formated as `%{1},%{2}\n`, we want it do be `%{1} %{2}\n\0`. */
- buf[got] = '\0';
- *strchr(buf, ',') = ' ';
-
/* Open the framebuffer device for reading. */
if (fbfd = open(fbpath, O_RDONLY), fbfd < 0)
return -1;
-
+
/* Create a FILE*, for writing, for the image file. */
file = fdopen(fd, "w");
if (file == NULL)
@@ -100,7 +89,7 @@ static int save_pnm(const char* fbpath, int fbno, int fd)
/* The PNM image should begin with `P3\n%{width} %{height}\n%{colour max=255}\n`.
('\n' and ' ' can be exchanged at will.) */
- fprintf(file, "P3\n%s255\n", buf);
+ fprintf(file, "P3\n%l %l255\n", width, height);
/* Convert raw framebuffer data into an PNM image. */
for (off = 0;;)
@@ -149,10 +138,12 @@ static int save_pnm(const char* fbpath, int fbno, int fd)
* @param fbname The framebuffer device
* @param imgname The pathname of the output image
* @param fbno The number of the framebuffer
+ * @param width The width of the image
+ * @param height The height of the image
* @param execname `argv[0]` from `main`
* @return Zero on success, -1 on error
*/
-static int save(const char* fbpath, const char* imgpath, int fbno, const char* execname)
+static int save(const char* fbpath, const char* imgpath, int fbno, long width, long height, const char* execname)
{
int pipe_rw[2];
pid_t pid, reaped;
@@ -161,11 +152,11 @@ static int save(const char* fbpath, const char* imgpath, int fbno, const char* e
/* Create a pipe that for sending data into the `convert` program. */
if (pipe(pipe_rw) < 0)
return -1;
-
+
/* Fork the process, the child will exec. `convert`. */
if (pid = fork(), pid == -1)
return saved_errno = errno, close(pipe_rw[0]), close(pipe_rw[1]), errno = saved_errno, -1;
-
+
/* Child process: */
if (pid == 0)
{
@@ -190,23 +181,60 @@ static int save(const char* fbpath, const char* imgpath, int fbno, const char* e
close(pipe_rw[0]);
/* Create a PNM-image of the framebuffer. */
- if (save_pnm(fbpath, fbno, pipe_rw[1]) < 0)
+ if (save_pnm(fbpath, fbno, width, height, pipe_rw[1]) < 0)
return saved_errno = errno, close(pipe_rw[1]), errno = saved_errno, -1;
/* Close the write-end of the pipe. */
close(pipe_rw[1]);
-
+
/* Wait for `convert` to exit. */
for (reaped = 0; reaped != pid;)
if (reaped = waitpid(pid, &status, 0), reaped < 0)
return -1;
-
+
/* Return successfully if and only if `convert` did. */
return status == 0 ? 0 : -1;
}
/**
+ * Get the dimensions of the framebuffer
+ *
+ * @param fbno The number of the framebuffer
+ * @param width Output parameter for the width of the image
+ * @param height Output parameter for the height of the image
+ * @return Zero on success, -1 on error
+ */
+static int measure(int fbno, long* width, long* height)
+{
+ char buf[PATH_MAX];
+ char* delim;
+ int sizefd, saved_errno;
+ ssize_t got;
+
+ /* Open the file with the framebuffer's dimensions. */
+ sprintf(buf, SYSDIR "/class/graphics/fb%i/virtual_size", fbno);
+ if (sizefd = open(buf, O_RDONLY), sizefd < 0)
+ return -1;
+
+ /* Get the dimensions of the framebuffer. */
+ if (got = read(sizefd, buf, sizeof(buf) / sizeof(char) - 1), got < 0)
+ return saved_errno = errno, close(sizefd), errno = saved_errno, -1;
+ close(sizefd);
+
+ /* The read content is formated as `%{width},%{height}\n`,
+ convert it to `%{width}\0%{height}\0` and parse it. */
+ buf[got] = '\0';
+ delim = strchr(buf, ',');
+ *delim++ = '\0';
+ *width = atol(buf);
+ *height = atol(delim);
+
+ return 0;
+}
+
+
+/**
* Take a screenshow of all framebuffers
*
* @param argc The number of elements in `argv`
@@ -218,6 +246,7 @@ int main(int argc, char* argv[])
char fbpath[PATH_MAX];
char imgpath[PATH_MAX];
int i, fbno;
+ long width, height;
(void) argc;
@@ -229,6 +258,10 @@ int main(int argc, char* argv[])
if (access(fbpath, F_OK))
break;
+ /* Get the size of the framebuffer. */
+ if (measure(fbno, &width, &height) < 0)
+ return perror(*argv), 1;
+
/* Get output pathname. */
sprintf(imgpath, "fb%i.png", fbno);
if (access(imgpath, F_OK) == 0)
@@ -240,7 +273,7 @@ int main(int argc, char* argv[])
}
/* Take a screenshot of the current framebuffer. */
- if (save(fbpath, imgpath, fbno, *argv) < 0)
+ if (save(fbpath, imgpath, fbno, width, height, *argv) < 0)
return perror(*argv), 1;
fprintf(stderr, "Saved framebuffer %i to %s\n", fbno, imgpath);
}