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authorMattias Andrée <maandree@operamail.com>2014-10-27 15:47:08 +0100
committerMattias Andrée <maandree@operamail.com>2014-10-27 15:47:08 +0100
commiteb4daa2387d15927e77d5de7d4feb7160ed56f93 (patch)
tree3123610201737693af8aeccad5acebb59f7b86b1 /src
parentupdate readme (diff)
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parse filename pattern
Signed-off-by: Mattias Andrée <maandree@operamail.com>
Diffstat (limited to 'src')
-rw-r--r--src/scrotty.c152
1 files changed, 138 insertions, 14 deletions
diff --git a/src/scrotty.c b/src/scrotty.c
index ecfa072..286a30d 100644
--- a/src/scrotty.c
+++ b/src/scrotty.c
@@ -33,7 +33,9 @@
#include <string.h>
#include <stdlib.h>
#include <stdint.h>
+#include <stdio.h>
#include <alloca.h>
+#include <time.h>
#ifndef PATH_MAX
@@ -259,12 +261,128 @@ static int measure(int fbno, long* width, long* height)
/**
+ * Duplicate all '%':s in a buffer until the first occurrence of a zero byte
+ *
+ * @param buf The buffer
+ * @param n The size of the buffer
+ * @return -1 if the buffer is too small, otherwise
+ * the new position of the first zero byte
+ */
+static ssize_t duplicate_percents(char* restrict buf, size_t n)
+{
+ size_t p = 0, pi, pc = 0, i;
+
+ /* Count number of '%':s. */
+ for (i = 0; buf[i]; i++)
+ if (buf[i] == '%')
+ pc++;
+
+ /* Check whether the string will overflow. */
+ if (i + pc > n)
+ return -1;
+
+ /* Duplicate all '%':s. */
+ for (pi = 0; pi < pc; pi++)
+ {
+ p = (size_t)(strchr(buf + p, '%') - buf);
+ memmove(buf + p + 1, buf + p, (i - (p - pi)) * sizeof(char));
+ p += 2;
+ }
+
+ return (ssize_t)(i + pi);
+}
+
+
+/**
+ * Parse and evaluate a --exec argument or filename pattern
+ *
+ * If `path != NULL` than all non-escaped spaces in
+ * `pattern` will be stored as 255-bytes in `buf`.
+ *
+ * @param buf The output buffer
+ * @param n The size of `buf`
+ * @param pattern The pattern to evaluate
+ * @param fbno The index of the framebuffer
+ * @param width The width of the image/framebuffer
+ * @param height The height of the image/framebuffer
+ * @param path The filename of the saved image, `NULL` during the evaluation of the filename pattern
+ * @return Zero on success, -1 on error
+ */
+static int evaluate(char* restrict buf, size_t n, const char* restrict pattern,
+ int fbno, long width, long height, const char* restrict path)
+{
+#define p(format, value) r = snprintf(buf + i, n - i, format "%zn", value, &j)
+
+ size_t i = 0;
+ ssize_t j = 0;
+ int percent = 0, backslash = 0, dollar = 0, r;
+ char c;
+ char* fmt;
+ time_t t;
+ struct tm tm;
+
+ while ((c = *pattern++))
+ {
+ if (dollar)
+ {
+ dollar = 0;
+ if (path == NULL)
+ if ((c == 'f') || (c == 'n'))
+ continue;
+ if (c == 'i') p("%i", fbno);
+ else if (c == 'f') p("%s", path);
+ else if (c == 'n') p("%s", strrchr(path, '/') ? (strrchr(path, '/') + 1) : path);
+ else if (c == 'p') p("%ju", (uintmax_t)width * (uintmax_t)height);
+ else if (c == 'w') p("%li", width);
+ else if (c == 'h') p("%li", height);
+ else if (c == '$') r = 0, j = 1, buf[i] = '$';
+ else
+ continue;
+ if ((r < 0) || (j <= 0))
+ return -1;
+ if ((c == 'f') || (c == 'n'))
+ if (j = duplicate_percents(buf + i, n - i), j < 0)
+ return errno = ENAMETOOLONG, -1;
+ i += (size_t)j;
+ }
+ else if (backslash) buf[i++] = (c == 'n' ? '\n' : c), backslash = 0;
+ else if (percent) buf[i++] = c, percent = 0;
+ else if (c == '%') buf[i++] = c, percent = 1;
+ else if (c == '\\') backslash = 1;
+ else if (c == '$') dollar = 1;
+ else if (c == ' ') buf[i++] = path == NULL ? ' ' : 255; /* 255 is not valid in UTF-8. */
+ else buf[i++] = c;
+
+ if (i >= n)
+ return errno = ENAMETOOLONG, -1;
+ }
+ buf[i] = '\0';
+
+ if (strchr(buf, '%') == NULL)
+ return 0;
+
+ fmt = alloca((strlen(buf) + 1) * sizeof(char));
+ memcpy(fmt, buf, (strlen(buf) + 1) * sizeof(char));
+
+ t = time(NULL);
+ localtime_r(&t, &tm);
+ if (strftime(buf, n, fmt, &tm) == 0)
+ return errno = ENAMETOOLONG, -1;
+
+ return 0;
+
+#undef p
+}
+
+
+/**
* Take a screenshot of a framebuffer
*
- * @param fbno The number of the framebuffer
- * @return Zero on success, -1 on error, 1 if the framebuffer does not exist
+ * @param fbno The number of the framebuffer
+ * @param filepattern The pattern for the filename, `NULL` for default
+ * @return Zero on success, -1 on error, 1 if the framebuffer does not exist
*/
-static int save_fb(int fbno)
+static int save_fb(int fbno, const char* filepattern)
{
char fbpath[PATH_MAX];
char imgpath[PATH_MAX];
@@ -279,16 +397,22 @@ static int save_fb(int fbno)
/* Get the size of the framebuffer. */
if (measure(fbno, &width, &height) < 0)
return -1;
-
+
/* Get output pathname. */
- sprintf(imgpath, "fb%i.png", fbno);
- if (access(imgpath, F_OK) == 0)
- for (i = 2;; i++)
- {
- sprintf(imgpath, "fb%i.png.%i", fbno, i);
- if (access(imgpath, F_OK))
- break;
- }
+ if (filepattern == NULL)
+ {
+ sprintf(imgpath, "fb%i.png", fbno);
+ if (access(imgpath, F_OK) == 0)
+ for (i = 2;; i++)
+ {
+ sprintf(imgpath, "fb%i.png.%i", fbno, i);
+ if (access(imgpath, F_OK))
+ break;
+ }
+ }
+ else
+ if (evaluate(imgpath, PATH_MAX, filepattern, fbno, width, height, NULL) < 0)
+ return -1;
/* Take a screenshot of the current framebuffer. */
if (save(fbpath, imgpath, fbno, width, height) < 0)
@@ -415,7 +539,7 @@ int main(int argc, char* argv[])
else if ((argv[i][0] == '-') || (filepattern != -1))
return fprintf(stderr, "Unrecognised option. Type `%s --help` for help.\n", execname), 1;
else
- filepattern = i; /* TODO use this */
+ filepattern = i;
}
/* Check that --exec is valid. */
@@ -439,7 +563,7 @@ int main(int argc, char* argv[])
/* Take a screenshot of each framebuffer. */
for (fbno = 0;; fbno++)
{
- r = save_fb(fbno);
+ r = save_fb(fbno, filepattern < 0 ? NULL : argv[filepattern]);
if (r < 0) return perror(execname), 1;
if (r > 0) break;
}