sendmail: Replace shell script by C implementation

[smailq.git] / sendmail.c

diff --git a/sendmail.c b/sendmail.c
new file mode 100644 (file)
index 0000000..8e2aa4f
--- /dev/null
+++ b/sendmail.c
@@ -0,0 +1,63 @@
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+
+static void usage(char* arg0) {
+    puts("A wrapper script for smailq that mimics sendmail.\n"
+         "USAGE:\n");
+    printf("  %s [OPTIONS] [recipient ...]\n", arg0);
+    printf("  %s -bp\n", arg0);
+    puts("\n"
+         "OPTIONS:\n"
+         "  -bp\n"
+         "     Calls `smailq --list`\n"
+         "\n"
+         "  -h\n"
+         "     Prints this help text\n"
+         "\n"
+         "  [OPTIONS] [recipient ...]\n"
+         "     Calls `smailq --send -- [OPTIONS] [recipient ...]`.\n"
+         "     It passes all options as MSA options to smailq.\n");
+}
+
+int main(int argc, char* argv[]) {
+    if (argc == 1) {
+        fputs("No arguments given.\n", stderr);
+        usage(argv[0]);
+        return EINVAL;
+    }
+
+    if (strcmp(argv[1], "-h") == 0) {
+        usage(argv[0]);
+        return EXIT_SUCCESS;
+    }
+
+    if (strcmp(argv[1], "-bp") == 0) {
+        execlp("smailq", "smailq", "list", NULL);
+        perror("Error calling smailq --list");
+        return EXIT_FAILURE;
+    }
+
+    /* We have to add two more arguments: -- --send */
+    char** newargv = malloc((argc+2)*sizeof(char*));
+    if (newargv == NULL) {
+        perror(NULL);
+        return EXIT_FAILURE;
+    }
+
+    /* Fill in the arguments for smailq. Note that argv[argc] is NULL and
+     * newargv must be termined by a NULL pointer for execvp(). */
+    newargv[0] = "smailq";
+    newargv[1] = "--send";
+    newargv[2] = "--";
+    for (int i=1; i <= argc; ++i)
+        newargv[2+i] = argv[i];
+
+    execvp("smailq", newargv);
+    perror("Error calling smailq --list");
+    free(newargv);
+    return EXIT_FAILURE;
+}