wget: add support for -S --server-response

Based on the patch by stephane.billiart@gmail.com

function                                             old     new   delta
ftpcmd                                                87     129     +42
fgets_and_trim                                        86     119     +33
static.wget_longopts                                 234     252     +18
packed_usage                                       31002   31015     +13
wget_main                                           2535    2540      +5
gethdr                                               158     163      +5
retrieve_file_data                                   424     428      +4
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 7/0 up/down: 120/0)             Total: 120 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 29 insertions, 20 deletions

diff --git a/networking/wget.c b/networking/wget.c
index a448acdae..90eedaf7a 100644
--- a/networking/wget.c
+++ b/networking/wget.c
@@ -94,20 +94,21 @@
 /* Since we ignore these opts, we don't show them in --help */
 /* //usage:    "        [--no-check-certificate] [--no-cache] [--passive-ftp] [-t TRIES]" */
 /* //usage:    "        [-nv] [-nc] [-nH] [-np]" */
-//usage:       "        [-U|--user-agent AGENT]" IF_FEATURE_WGET_TIMEOUT(" [-T SEC]") " URL..."
+//usage:       "        [-S|--server-response] [-U|--user-agent AGENT]" IF_FEATURE_WGET_TIMEOUT(" [-T SEC]") " URL..."
 //usage:        )
 //usage:        IF_NOT_FEATURE_WGET_LONG_OPTIONS(
-//usage:       "[-cq] [-O FILE] [-Y on/off] [-P DIR] [-U AGENT]"
+//usage:       "[-cq] [-O FILE] [-Y on/off] [-P DIR] [-S] [-U AGENT]"
 //usage:                        IF_FEATURE_WGET_TIMEOUT(" [-T SEC]") " URL..."
 //usage:        )
 //usage:#define wget_full_usage "\n\n"
 //usage:       "Retrieve files via HTTP or FTP\n"
 //usage:        IF_FEATURE_WGET_LONG_OPTIONS(
-//usage:     "\n        --spider        Spider mode - only check file existence"
+//usage:     "\n        --spider        Only check URL existence: $? is 0 if exists"
 //usage:        )
 //usage:     "\n        -c              Continue retrieval of aborted transfer"
 //usage:     "\n        -q              Quiet"
 //usage:     "\n        -P DIR          Save to DIR (default .)"
+//usage:     "\n        -S              Show server response"
 //usage:        IF_FEATURE_WGET_TIMEOUT(
 //usage:     "\n        -T SEC          Network read timeout is SEC seconds"
 //usage:        )
@@ -223,16 +224,17 @@ struct globals {
 enum {
         WGET_OPT_CONTINUE   = (1 << 0),
         WGET_OPT_QUIET      = (1 << 1),
-        WGET_OPT_OUTNAME    = (1 << 2),
-        WGET_OPT_PREFIX     = (1 << 3),
-        WGET_OPT_PROXY      = (1 << 4),
-        WGET_OPT_USER_AGENT = (1 << 5),
-        WGET_OPT_NETWORK_READ_TIMEOUT = (1 << 6),
-        WGET_OPT_RETRIES    = (1 << 7),
-        WGET_OPT_nsomething = (1 << 8),
-        WGET_OPT_HEADER     = (1 << 9) * ENABLE_FEATURE_WGET_LONG_OPTIONS,
-        WGET_OPT_POST_DATA  = (1 << 10) * ENABLE_FEATURE_WGET_LONG_OPTIONS,
-        WGET_OPT_SPIDER     = (1 << 11) * ENABLE_FEATURE_WGET_LONG_OPTIONS,
+        WGET_OPT_SERVER_RESPONSE = (1 << 2),
+        WGET_OPT_OUTNAME    = (1 << 3),
+        WGET_OPT_PREFIX     = (1 << 4),
+        WGET_OPT_PROXY      = (1 << 5),
+        WGET_OPT_USER_AGENT = (1 << 6),
+        WGET_OPT_NETWORK_READ_TIMEOUT = (1 << 7),
+        WGET_OPT_RETRIES    = (1 << 8),
+        WGET_OPT_nsomething = (1 << 9),
+        WGET_OPT_HEADER     = (1 << 10) * ENABLE_FEATURE_WGET_LONG_OPTIONS,
+        WGET_OPT_POST_DATA  = (1 << 11) * ENABLE_FEATURE_WGET_LONG_OPTIONS,
+        WGET_OPT_SPIDER     = (1 << 12) * ENABLE_FEATURE_WGET_LONG_OPTIONS,
 };
 
 enum {
@@ -386,7 +388,7 @@ static FILE *open_socket(len_and_sockaddr *lsa)
 }
 
 /* Returns '\n' if it was seen, else '\0'. Trims at first '\r' or '\n' */
-static char fgets_and_trim(FILE *fp)
+static char fgets_and_trim(FILE *fp, const char *fmt)
 {
         char c;
         char *buf_ptr;
@@ -404,6 +406,9 @@ static char fgets_and_trim(FILE *fp)
 
         log_io("< %s", G.wget_buf);
 
+        if (fmt && (option_mask32 & WGET_OPT_SERVER_RESPONSE))
+                fprintf(stderr, fmt, G.wget_buf);
+
         return c;
 }
 
@@ -414,12 +419,15 @@ static int ftpcmd(const char *s1, const char *s2, FILE *fp)
                 if (!s2)
                         s2 = "";
                 fprintf(fp, "%s%s\r\n", s1, s2);
+                /* With --server-response, wget also shows its ftp commands */
+                if (option_mask32 & WGET_OPT_SERVER_RESPONSE)
+                        fprintf(stderr, "--> %s%s\n\n", s1, s2);
                 fflush(fp);
                 log_io("> %s%s", s1, s2);
         }
 
         do {
-                fgets_and_trim(fp);
+                fgets_and_trim(fp, "%s\n");
         } while (!isdigit(G.wget_buf[0]) || G.wget_buf[3] != ' ');
 
         G.wget_buf[3] = '\0';
@@ -516,7 +524,7 @@ static char *gethdr(FILE *fp)
         int c;
 
         /* retrieve header line */
-        c = fgets_and_trim(fp);
+        c = fgets_and_trim(fp, "  %s\n");
 
         /* end of the headers? */
         if (G.wget_buf[0] == '\0')
@@ -884,9 +892,9 @@ static void NOINLINE retrieve_file_data(FILE *dfp)
                 if (!G.chunked)
                         break;
 
-                fgets_and_trim(dfp); /* Eat empty line */
+                fgets_and_trim(dfp, NULL); /* Eat empty line */
  get_clen:
-                fgets_and_trim(dfp);
+                fgets_and_trim(dfp, NULL);
                 G.content_len = STRTOOFF(G.wget_buf, NULL, 16);
                 /* FIXME: error check? */
                 if (G.content_len == 0)
@@ -1116,7 +1124,7 @@ static void download_one_url(const char *url)
                  * Retrieve HTTP response line and check for "200" status code.
                  */
  read_response:
-                fgets_and_trim(sfp);
+                fgets_and_trim(sfp, "  %s\n");
 
                 str = G.wget_buf;
                 str = skip_non_whitespace(str);
@@ -1301,6 +1309,7 @@ int wget_main(int argc UNUSED_PARAM, char **argv)
                 /* name, has_arg, val */
                 "continue\0"         No_argument       "c"
                 "quiet\0"            No_argument       "q"
+                "server-response\0"  No_argument       "S"
                 "output-document\0"  Required_argument "O"
                 "directory-prefix\0" Required_argument "P"
                 "proxy\0"            Required_argument "Y"
@@ -1343,7 +1352,7 @@ IF_DESKTOP(	"no-parent\0"        No_argument       "\xf0")
 #endif
         opt_complementary = "-1" /* at least one URL */
                 IF_FEATURE_WGET_LONG_OPTIONS(":\xff::"); /* --header is a list */
-        getopt32(argv, "cqO:P:Y:U:T:+"
+        getopt32(argv, "cqSO:P:Y:U:T:+"
                 /*ignored:*/ "t:"
                 /*ignored:*/ "n::"
                 /* wget has exactly four -n<letter> opts, all of which we can ignore: