[gnurl] 155/411: ftp: get rid of the PPSENDF macro

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nikita pushed a commit to branch master
in repository gnurl.

commit cc372af1e9cd12d5dbb4d0380a47a8e017896da8
Author: Daniel Stenberg <daniel@haxx.se>
AuthorDate: Thu Sep 17 15:15:08 2020 +0200

    ftp: get rid of the PPSENDF macro
    
    The use of such a macro hides some of what's actually going on to the
    reader and is generally disapproved of in the project.
    
    Closes #5971
---
 lib/ftp.c | 306 ++++++++++++++++++++++++++++++--------------------------------
 1 file changed, 150 insertions(+), 156 deletions(-)

diff --git a/lib/ftp.c b/lib/ftp.c
index d4ecf9a96..868a97a53 100644
--- a/lib/ftp.c
+++ b/lib/ftp.c
@@ -137,14 +137,10 @@ static int ftp_domore_getsock(struct connectdata *conn, 
curl_socket_t *socks);
 static CURLcode ftp_doing(struct connectdata *conn,
                           bool *dophase_done);
 static CURLcode ftp_setup_connection(struct connectdata *conn);
-
 static CURLcode init_wc_data(struct connectdata *conn);
 static CURLcode wc_statemach(struct connectdata *conn);
-
 static void wc_data_dtor(void *ptr);
-
 static CURLcode ftp_state_retr(struct connectdata *conn, curl_off_t filesize);
-
 static CURLcode ftp_readresp(curl_socket_t sockfd,
                              struct pingpong *pp,
                              int *ftpcode,
@@ -152,12 +148,6 @@ static CURLcode ftp_readresp(curl_socket_t sockfd,
 static CURLcode ftp_dophase_done(struct connectdata *conn,
                                  bool connected);
 
-/* easy-to-use macro: */
-#define PPSENDF(x,y,z)  result = Curl_pp_sendf(x,y,z); \
-                        if(result)                     \
-                          return result
-
-
 /*
  * FTP protocol handler.
  */
@@ -775,25 +765,22 @@ static void _state(struct connectdata *conn,
 
 static CURLcode ftp_state_user(struct connectdata *conn)
 {
-  CURLcode result;
-  /* send USER */
-  PPSENDF(&conn->proto.ftpc.pp, "USER %s", conn->user?conn->user:"");
-
-  state(conn, FTP_USER);
-  conn->data->state.ftp_trying_alternative = FALSE;
-
-  return CURLE_OK;
+  CURLcode result = Curl_pp_sendf(&conn->proto.ftpc.pp, "USER %s",
+                                  conn->user?conn->user:"");
+  if(!result) {
+    state(conn, FTP_USER);
+    conn->data->state.ftp_trying_alternative = FALSE;
+  }
+  return result;
 }
 
 static CURLcode ftp_state_pwd(struct connectdata *conn)
 {
-  CURLcode result;
-
-  /* send PWD to discover our entry point */
-  PPSENDF(&conn->proto.ftpc.pp, "%s", "PWD");
-  state(conn, FTP_PWD);
+  CURLcode result = Curl_pp_sendf(&conn->proto.ftpc.pp, "%s", "PWD");
+  if(!result)
+    state(conn, FTP_PWD);
 
-  return CURLE_OK;
+  return result;
 }
 
 /* For the FTP "protocol connect" and "doing" phases only */
@@ -881,16 +868,19 @@ static CURLcode ftp_state_cwd(struct connectdata *conn)
          where we ended up after login: */
       ftpc->cwdcount = 0; /* we count this as the first path, then we add one
                              for all upcoming ones in the ftp->dirs[] array */
-      PPSENDF(&conn->proto.ftpc.pp, "CWD %s", ftpc->entrypath);
-      state(conn, FTP_CWD);
+      result = Curl_pp_sendf(&ftpc->pp, "CWD %s", ftpc->entrypath);
+      if(!result)
+        state(conn, FTP_CWD);
     }
     else {
       if(ftpc->dirdepth) {
         ftpc->cwdcount = 1;
         /* issue the first CWD, the rest is sent when the CWD responses are
            received... */
-        PPSENDF(&conn->proto.ftpc.pp, "CWD %s", ftpc->dirs[ftpc->cwdcount -1]);
-        state(conn, FTP_CWD);
+        result = Curl_pp_sendf(&ftpc->pp, "CWD %s",
+                               ftpc->dirs[ftpc->cwdcount -1]);
+        if(!result)
+          state(conn, FTP_CWD);
       }
       else {
         /* No CWD necessary */
@@ -1326,12 +1316,12 @@ static CURLcode ftp_state_use_pasv(struct connectdata 
*conn)
 
   modeoff = conn->bits.ftp_use_epsv?0:1;
 
-  PPSENDF(&ftpc->pp, "%s", mode[modeoff]);
-
-  ftpc->count1 = modeoff;
-  state(conn, FTP_PASV);
-  infof(conn->data, "Connect data stream passively\n");
-
+  result = Curl_pp_sendf(&ftpc->pp, "%s", mode[modeoff]);
+  if(!result) {
+    ftpc->count1 = modeoff;
+    state(conn, FTP_PASV);
+    infof(conn->data, "Connect data stream passively\n");
+  }
   return result;
 }
 
@@ -1364,23 +1354,23 @@ static CURLcode ftp_state_prepare_transfer(struct 
connectdata *conn)
     if(data->set.ftp_use_pret) {
       /* The user has requested that we send a PRET command
          to prepare the server for the upcoming PASV */
-      if(!conn->proto.ftpc.file) {
-        PPSENDF(&conn->proto.ftpc.pp, "PRET %s",
-                data->set.str[STRING_CUSTOMREQUEST]?
-                data->set.str[STRING_CUSTOMREQUEST]:
-                (data->set.ftp_list_only?"NLST":"LIST"));
-      }
-      else if(data->set.upload) {
-        PPSENDF(&conn->proto.ftpc.pp, "PRET STOR %s", conn->proto.ftpc.file);
-      }
-      else {
-        PPSENDF(&conn->proto.ftpc.pp, "PRET RETR %s", conn->proto.ftpc.file);
-      }
-      state(conn, FTP_PRET);
+      struct ftp_conn *ftpc = &conn->proto.ftpc;
+      if(!conn->proto.ftpc.file)
+        result = Curl_pp_sendf(&ftpc->pp, "PRET %s",
+                               data->set.str[STRING_CUSTOMREQUEST]?
+                               data->set.str[STRING_CUSTOMREQUEST]:
+                               (data->set.ftp_list_only?"NLST":"LIST"));
+      else if(data->set.upload)
+        result = Curl_pp_sendf(&ftpc->pp, "PRET STOR %s",
+                               conn->proto.ftpc.file);
+      else
+        result = Curl_pp_sendf(&ftpc->pp, "PRET RETR %s",
+                               conn->proto.ftpc.file);
+      if(!result)
+        state(conn, FTP_PRET);
     }
-    else {
+    else
       result = ftp_state_use_pasv(conn);
-    }
   }
   return result;
 }
@@ -1396,9 +1386,9 @@ static CURLcode ftp_state_rest(struct connectdata *conn)
 
     /* Determine if server can respond to REST command and therefore
        whether it supports range */
-    PPSENDF(&conn->proto.ftpc.pp, "REST %d", 0);
-
-    state(conn, FTP_REST);
+    result = Curl_pp_sendf(&ftpc->pp, "REST %d", 0);
+    if(!result)
+      state(conn, FTP_REST);
   }
   else
     result = ftp_state_prepare_transfer(conn);
@@ -1416,9 +1406,9 @@ static CURLcode ftp_state_size(struct connectdata *conn)
     /* if a "head"-like request is being made (on a file) */
 
     /* we know ftpc->file is a valid pointer to a file name */
-    PPSENDF(&ftpc->pp, "SIZE %s", ftpc->file);
-
-    state(conn, FTP_SIZE);
+    result = Curl_pp_sendf(&ftpc->pp, "SIZE %s", ftpc->file);
+    if(!result)
+      state(conn, FTP_SIZE);
   }
   else
     result = ftp_state_rest(conn);
@@ -1485,10 +1475,8 @@ static CURLcode ftp_state_list(struct connectdata *conn)
   result = Curl_pp_sendf(&conn->proto.ftpc.pp, "%s", cmd);
   free(cmd);
 
-  if(result)
-    return result;
-
-  state(conn, FTP_LIST);
+  if(!result)
+    state(conn, FTP_LIST);
 
   return result;
 }
@@ -1549,9 +1537,10 @@ static CURLcode ftp_state_mdtm(struct connectdata *conn)
 
     /* we have requested to get the modified-time of the file, this is a white
        spot as the MDTM is not mentioned in RFC959 */
-    PPSENDF(&ftpc->pp, "MDTM %s", ftpc->file);
+    result = Curl_pp_sendf(&ftpc->pp, "MDTM %s", ftpc->file);
 
-    state(conn, FTP_MDTM);
+    if(!result)
+      state(conn, FTP_MDTM);
   }
   else
     result = ftp_state_type(conn);
@@ -1587,8 +1576,9 @@ static CURLcode ftp_state_ul_setup(struct connectdata 
*conn,
 
     if(data->state.resume_from < 0) {
       /* Got no given size to start from, figure it out */
-      PPSENDF(&ftpc->pp, "SIZE %s", ftpc->file);
-      state(conn, FTP_STOR_SIZE);
+      result = Curl_pp_sendf(&ftpc->pp, "SIZE %s", ftpc->file);
+      if(!result)
+        state(conn, FTP_STOR_SIZE);
       return result;
     }
 
@@ -1650,10 +1640,10 @@ static CURLcode ftp_state_ul_setup(struct connectdata 
*conn,
     /* we've passed, proceed as normal */
   } /* resume_from */
 
-  PPSENDF(&ftpc->pp, data->set.ftp_append?"APPE %s":"STOR %s",
-          ftpc->file);
-
-  state(conn, FTP_STOR);
+  result = Curl_pp_sendf(&ftpc->pp, data->set.ftp_append?"APPE %s":"STOR %s",
+                         ftpc->file);
+  if(!result)
+    state(conn, FTP_STOR);
 
   return result;
 }
@@ -1711,7 +1701,9 @@ static CURLcode ftp_state_quote(struct connectdata *conn,
       else
         ftpc->count2 = 0; /* failure means cancel operation */
 
-      PPSENDF(&ftpc->pp, "%s", cmd);
+      result = Curl_pp_sendf(&ftpc->pp, "%s", cmd);
+      if(result)
+        return result;
       state(conn, instate);
       quote = TRUE;
     }
@@ -1740,12 +1732,14 @@ static CURLcode ftp_state_quote(struct connectdata 
*conn,
                the server terminates it, otherwise the client stops if the
                received byte count exceeds the reported file size.  Set option
                CURLOPT_IGNORE_CONTENT_LENGTH to 1 to enable this behavior.*/
-            PPSENDF(&ftpc->pp, "RETR %s", ftpc->file);
-            state(conn, FTP_RETR);
+            result = Curl_pp_sendf(&ftpc->pp, "RETR %s", ftpc->file);
+            if(!result)
+              state(conn, FTP_RETR);
           }
           else {
-            PPSENDF(&ftpc->pp, "SIZE %s", ftpc->file);
-            state(conn, FTP_RETR_SIZE);
+            result = Curl_pp_sendf(&ftpc->pp, "SIZE %s", ftpc->file);
+            if(!result)
+              state(conn, FTP_RETR_SIZE);
           }
         }
       }
@@ -1782,10 +1776,12 @@ static CURLcode ftp_epsv_disable(struct connectdata 
*conn)
   conn->bits.ftp_use_epsv = FALSE;
   conn->data->state.errorbuf = FALSE; /* allow error message to get
                                          rewritten */
-  PPSENDF(&conn->proto.ftpc.pp, "%s", "PASV");
-  conn->proto.ftpc.count1++;
-  /* remain in/go to the FTP_PASV state */
-  state(conn, FTP_PASV);
+  result = Curl_pp_sendf(&conn->proto.ftpc.pp, "%s", "PASV");
+  if(!result) {
+    conn->proto.ftpc.count1++;
+    /* remain in/go to the FTP_PASV state */
+    state(conn, FTP_PASV);
+  }
   return result;
 }
 
@@ -2229,15 +2225,16 @@ static CURLcode ftp_state_retr(struct connectdata *conn,
     infof(data, "Instructs server to resume from offset %"
           CURL_FORMAT_CURL_OFF_T "\n", data->state.resume_from);
 
-    PPSENDF(&ftpc->pp, "REST %" CURL_FORMAT_CURL_OFF_T,
-            data->state.resume_from);
-
-    state(conn, FTP_RETR_REST);
+    result = Curl_pp_sendf(&ftpc->pp, "REST %" CURL_FORMAT_CURL_OFF_T,
+                           data->state.resume_from);
+    if(!result)
+      state(conn, FTP_RETR_REST);
   }
   else {
     /* no resume */
-    PPSENDF(&ftpc->pp, "RETR %s", ftpc->file);
-    state(conn, FTP_RETR);
+    result = Curl_pp_sendf(&ftpc->pp, "RETR %s", ftpc->file);
+    if(!result)
+      state(conn, FTP_RETR);
   }
 
   return result;
@@ -2330,8 +2327,9 @@ static CURLcode ftp_state_rest_resp(struct connectdata 
*conn,
       result = CURLE_FTP_COULDNT_USE_REST;
     }
     else {
-      PPSENDF(&ftpc->pp, "RETR %s", ftpc->file);
-      state(conn, FTP_RETR);
+      result = Curl_pp_sendf(&ftpc->pp, "RETR %s", ftpc->file);
+      if(!result)
+        state(conn, FTP_RETR);
     }
     break;
   }
@@ -2523,8 +2521,9 @@ static CURLcode ftp_state_loggedin(struct connectdata 
*conn)
     parameter of '0' to indicate that no buffering is taking place
     and the data connection should not be encapsulated.
     */
-    PPSENDF(&conn->proto.ftpc.pp, "PBSZ %d", 0);
-    state(conn, FTP_PBSZ);
+    result = Curl_pp_sendf(&conn->proto.ftpc.pp, "PBSZ %d", 0);
+    if(!result)
+      state(conn, FTP_PBSZ);
   }
   else {
     result = ftp_state_pwd(conn);
@@ -2546,8 +2545,9 @@ static CURLcode ftp_state_user_resp(struct connectdata 
*conn,
   if((ftpcode == 331) && (ftpc->state == FTP_USER)) {
     /* 331 Password required for ...
        (the server requires to send the user's password too) */
-    PPSENDF(&ftpc->pp, "PASS %s", conn->passwd?conn->passwd:"");
-    state(conn, FTP_PASS);
+    result = Curl_pp_sendf(&ftpc->pp, "PASS %s", conn->passwd?conn->passwd:"");
+    if(!result)
+      state(conn, FTP_PASS);
   }
   else if(ftpcode/100 == 2) {
     /* 230 User ... logged in.
@@ -2556,8 +2556,10 @@ static CURLcode ftp_state_user_resp(struct connectdata 
*conn,
   }
   else if(ftpcode == 332) {
     if(data->set.str[STRING_FTP_ACCOUNT]) {
-      PPSENDF(&ftpc->pp, "ACCT %s", data->set.str[STRING_FTP_ACCOUNT]);
-      state(conn, FTP_ACCT);
+      result = Curl_pp_sendf(&ftpc->pp, "ACCT %s",
+                             data->set.str[STRING_FTP_ACCOUNT]);
+      if(!result)
+        state(conn, FTP_ACCT);
     }
     else {
       failf(data, "ACCT requested but none available");
@@ -2573,11 +2575,13 @@ static CURLcode ftp_state_user_resp(struct connectdata 
*conn,
     if(conn->data->set.str[STRING_FTP_ALTERNATIVE_TO_USER] &&
         !conn->data->state.ftp_trying_alternative) {
       /* Ok, USER failed.  Let's try the supplied command. */
-      PPSENDF(&conn->proto.ftpc.pp, "%s",
-              conn->data->set.str[STRING_FTP_ALTERNATIVE_TO_USER]);
-      conn->data->state.ftp_trying_alternative = TRUE;
-      state(conn, FTP_USER);
-      result = CURLE_OK;
+      result =
+        Curl_pp_sendf(&ftpc->pp, "%s",
+                      conn->data->set.str[STRING_FTP_ALTERNATIVE_TO_USER]);
+      if(!result) {
+        conn->data->state.ftp_trying_alternative = TRUE;
+        state(conn, FTP_USER);
+      }
     }
     else {
       failf(data, "Access denied: %03d", ftpcode);
@@ -2679,15 +2683,12 @@ static CURLcode ftp_statemach_act(struct connectdata 
*conn)
                 (int)data->set.ftpsslauth);
           return CURLE_UNKNOWN_OPTION; /* we don't know what to do */
         }
-        PPSENDF(&ftpc->pp, "AUTH %s", ftpauth[ftpc->count1]);
-        state(conn, FTP_AUTH);
+        result = Curl_pp_sendf(&ftpc->pp, "AUTH %s", ftpauth[ftpc->count1]);
+        if(!result)
+          state(conn, FTP_AUTH);
       }
-      else {
+      else
         result = ftp_state_user(conn);
-        if(result)
-          return result;
-      }
-
       break;
 
     case FTP_AUTH:
@@ -2722,9 +2723,6 @@ static CURLcode ftp_statemach_act(struct connectdata 
*conn)
           /* ignore the failure and continue */
           result = ftp_state_user(conn);
       }
-
-      if(result)
-        return result;
       break;
 
     case FTP_USER:
@@ -2737,10 +2735,11 @@ static CURLcode ftp_statemach_act(struct connectdata 
*conn)
       break;
 
     case FTP_PBSZ:
-      PPSENDF(&ftpc->pp, "PROT %c",
-              data->set.use_ssl == CURLUSESSL_CONTROL ? 'C' : 'P');
-      state(conn, FTP_PROT);
-
+      result =
+        Curl_pp_sendf(&ftpc->pp, "PROT %c",
+                      data->set.use_ssl == CURLUSESSL_CONTROL ? 'C' : 'P');
+      if(!result)
+        state(conn, FTP_PROT);
       break;
 
     case FTP_PROT:
@@ -2757,14 +2756,12 @@ static CURLcode ftp_statemach_act(struct connectdata 
*conn)
       if(data->set.ftp_ccc) {
         /* CCC - Clear Command Channel
          */
-        PPSENDF(&ftpc->pp, "%s", "CCC");
-        state(conn, FTP_CCC);
+        result = Curl_pp_sendf(&ftpc->pp, "%s", "CCC");
+        if(!result)
+          state(conn, FTP_CCC);
       }
-      else {
+      else
         result = ftp_state_pwd(conn);
-        if(result)
-          return result;
-      }
       break;
 
     case FTP_CCC:
@@ -2772,16 +2769,12 @@ static CURLcode ftp_statemach_act(struct connectdata 
*conn)
         /* First shut down the SSL layer (note: this call will block) */
         result = Curl_ssl_shutdown(conn, FIRSTSOCKET);
 
-        if(result) {
+        if(result)
           failf(conn->data, "Failed to clear the command channel (CCC)");
-          return result;
-        }
       }
-
-      /* Then continue as normal */
-      result = ftp_state_pwd(conn);
-      if(result)
-        return result;
+      if(!result)
+        /* Then continue as normal */
+        result = ftp_state_pwd(conn);
       break;
 
     case FTP_PWD:
@@ -2847,7 +2840,6 @@ static CURLcode ftp_statemach_act(struct connectdata 
*conn)
              systems. */
 
           if(!ftpc->server_os && dir[0] != '/') {
-
             result = Curl_pp_sendf(&ftpc->pp, "%s", "SYST");
             if(result) {
               free(dir);
@@ -2943,12 +2935,10 @@ static CURLcode ftp_statemach_act(struct connectdata 
*conn)
       if((ftpcode >= 400) && !ftpc->count2) {
         /* failure response code, and not allowed to fail */
         failf(conn->data, "QUOT command failed with %03d", ftpcode);
-        return CURLE_QUOTE_ERROR;
+        result = CURLE_QUOTE_ERROR;
       }
-      result = ftp_state_quote(conn, FALSE, ftpc->state);
-      if(result)
-        return result;
-
+      else
+        result = ftp_state_quote(conn, FALSE, ftpc->state);
       break;
 
     case FTP_CWD:
@@ -2958,29 +2948,28 @@ static CURLcode ftp_statemach_act(struct connectdata 
*conn)
            ftpc->cwdcount && !ftpc->count2) {
           /* try making it */
           ftpc->count2++; /* counter to prevent CWD-MKD loops */
-          PPSENDF(&ftpc->pp, "MKD %s", ftpc->dirs[ftpc->cwdcount - 1]);
-          state(conn, FTP_MKD);
+          result = Curl_pp_sendf(&ftpc->pp, "MKD %s",
+                                 ftpc->dirs[ftpc->cwdcount - 1]);
+          if(!result)
+            state(conn, FTP_MKD);
         }
         else {
           /* return failure */
           failf(data, "Server denied you to change to the given directory");
           ftpc->cwdfail = TRUE; /* don't remember this path as we failed
                                    to enter it */
-          return CURLE_REMOTE_ACCESS_DENIED;
+          result = CURLE_REMOTE_ACCESS_DENIED;
         }
       }
       else {
         /* success */
         ftpc->count2 = 0;
-        if(++ftpc->cwdcount <= ftpc->dirdepth) {
+        if(++ftpc->cwdcount <= ftpc->dirdepth)
           /* send next CWD */
-          PPSENDF(&ftpc->pp, "CWD %s", ftpc->dirs[ftpc->cwdcount - 1]);
-        }
-        else {
+          result = Curl_pp_sendf(&ftpc->pp, "CWD %s",
+                                 ftpc->dirs[ftpc->cwdcount - 1]);
+        else
           result = ftp_state_mdtm(conn);
-          if(result)
-            return result;
-        }
       }
       break;
 
@@ -2988,11 +2977,14 @@ static CURLcode ftp_statemach_act(struct connectdata 
*conn)
       if((ftpcode/100 != 2) && !ftpc->count3--) {
         /* failure to MKD the dir */
         failf(data, "Failed to MKD dir: %03d", ftpcode);
-        return CURLE_REMOTE_ACCESS_DENIED;
+        result = CURLE_REMOTE_ACCESS_DENIED;
+      }
+      else {
+        state(conn, FTP_CWD);
+        /* send CWD */
+        result = Curl_pp_sendf(&ftpc->pp, "CWD %s",
+                               ftpc->dirs[ftpc->cwdcount - 1]);
       }
-      state(conn, FTP_CWD);
-      /* send CWD */
-      PPSENDF(&ftpc->pp, "CWD %s", ftpc->dirs[ftpc->cwdcount - 1]);
       break;
 
     case FTP_MDTM:
@@ -3372,17 +3364,17 @@ static
 CURLcode ftp_sendquote(struct connectdata *conn, struct curl_slist *quote)
 {
   struct curl_slist *item;
-  ssize_t nread;
-  int ftpcode;
-  CURLcode result;
   struct ftp_conn *ftpc = &conn->proto.ftpc;
   struct pingpong *pp = &ftpc->pp;
 
   item = quote;
   while(item) {
     if(item->data) {
+      ssize_t nread;
       char *cmd = item->data;
       bool acceptfail = FALSE;
+      CURLcode result;
+      int ftpcode = 0;
 
       /* if a command starts with an asterisk, which a legal FTP command never
          can, the command will be allowed to fail without it causing any
@@ -3394,11 +3386,11 @@ CURLcode ftp_sendquote(struct connectdata *conn, struct 
curl_slist *quote)
         acceptfail = TRUE;
       }
 
-      PPSENDF(&conn->proto.ftpc.pp, "%s", cmd);
-
-      pp->response = Curl_now(); /* timeout relative now */
-
-      result = Curl_GetFTPResponse(&nread, conn, &ftpcode);
+      result = Curl_pp_sendf(&ftpc->pp, "%s", cmd);
+      if(!result) {
+        pp->response = Curl_now(); /* timeout relative now */
+        result = Curl_GetFTPResponse(&nread, conn, &ftpcode);
+      }
       if(result)
         return result;
 
@@ -3446,12 +3438,14 @@ static CURLcode ftp_nb_type(struct connectdata *conn,
     return ftp_state_type_resp(conn, 200, newstate);
   }
 
-  PPSENDF(&ftpc->pp, "TYPE %c", want);
-  state(conn, newstate);
+  result = Curl_pp_sendf(&ftpc->pp, "TYPE %c", want);
+  if(!result) {
+    state(conn, newstate);
 
-  /* keep track of our current transfer type */
-  ftpc->transfertype = want;
-  return CURLE_OK;
+    /* keep track of our current transfer type */
+    ftpc->transfertype = want;
+  }
+  return result;
 }
 
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