+ /*
+ * The syntax @filename means read the string to send from the
+ * file `filename'.
+ */
+ if (s[0] == '@') {
+ /* skip the @ and any following white-space */
+ char *fn = s;
+ while (*++fn == ' ' || *fn == '\t')
+ ;
+
+ if (*fn != 0) {
+ FILE *f;
+ int n = 0;
+
+ /* open the file and read until STR_LEN-1 bytes or end-of-file */
+ f = fopen(fn, "r");
+ if (f == NULL)
+ fatal(1, "%s -- open failed: %m", fn);
+ while (n < STR_LEN - 1) {
+ int nr = fread(&file_data[n], 1, STR_LEN - 1 - n, f);
+ if (nr < 0)
+ fatal(1, "%s -- read error", fn);
+ if (nr == 0)
+ break;
+ n += nr;
+ }
+ fclose(f);
+
+ /* use the string we got as the string to send,
+ but trim off the final newline if any. */
+ if (n > 0 && file_data[n-1] == '\n')
+ --n;
+ file_data[n] = 0;
+ s = file_data;
+ }
+ }
+