enmetric() for small values #256

src/demo/demo.c

@@ -410,20 +410,22 @@ int main(int argc, char** argv){
   }
   bool failed = false;
   printf("\n");
-  printf("        total│frames│output(B)│ rendering│%%r│%6s│\n", "FPS");
-  printf("══╤═╤════════╪══════╪═════════╪══════════╪══╪══════╡\n");
+  printf("        total│frames│output(B)│rendering│%%r│%6s│\n", "FPS");
+  printf("══╤═╤════════╪══════╪═════════╪═════════╪══╪══════╡\n");
   for(size_t i = 0 ; i < strlen(demos) ; ++i){
     char totalbuf[BPREFIXSTRLEN + 1];
+    char rtimebuf[PREFIXSTRLEN + 1];
     char timebuf[PREFIXSTRLEN + 1];
     qprefix(results[i].timens, GIG, timebuf, 0);
+    qprefix(results[i].stats.render_ns, GIG, rtimebuf, 0);
     bprefix(results[i].stats.render_bytes, 1, totalbuf, 0);
     double avg = results[i].stats.render_ns / (double)results[i].stats.renders;
-    printf("%2zu│%c│%*ss│%6lu│%*s│%8juµs│%2ld│%6.1f│%s\n", i,
+    printf("%2zu│%c│%*ss│%6lu│%*s│ %*ss│%2ld│%6.1f│%s\n", i,
            results[i].selector,
            PREFIXSTRLEN, timebuf,
            results[i].stats.renders,
            BPREFIXSTRLEN, totalbuf,
-           results[i].stats.render_ns / 1000,
+           PREFIXSTRLEN, rtimebuf,
            results[i].timens ?
             results[i].stats.render_ns * 100 / results[i].timens : 0,
            GIG / avg,

src/lib/enmetric.c

@@ -18,6 +18,8 @@ convinit(void){
 const char *enmetric(uintmax_t val, unsigned decimal, char *buf, int omitdec,
                      unsigned mult, int uprefix){
   const char prefixes[] = "KMGTPEZY"; // 10^21-1 encompasses 2^64-1
+  // FIXME can't use multibyte μ unless we enlarge the target buffer
+  const char subprefixes[] = "munpfazy"; // 10^24-1
   unsigned consumed = 0;
   uintmax_t dv;
 
@@ -29,12 +31,22 @@ const char *enmetric(uintmax_t val, unsigned decimal, char *buf, int omitdec,
     return NULL;
   }
   dv = mult;
-  // FIXME verify that input < 2^89, wish we had static_assert() :/
-  while((val / decimal) >= dv && consumed < strlen(prefixes)){
-    dv *= mult;
-    ++consumed;
-    if(UINTMAX_MAX / dv < mult){ // near overflow--can't scale dv again
-      break;
+  if(decimal <= val || val == 0){
+    // FIXME verify that input < 2^89, wish we had static_assert() :/
+    while((val / decimal) >= dv && consumed < strlen(prefixes)){
+      dv *= mult;
+      ++consumed;
+      if(UINTMAX_MAX / dv < mult){ // near overflow--can't scale dv again
+        break;
+      }
+    }
+  }else{
+    while(val < decimal && consumed < strlen(subprefixes)){
+      val *= mult;
+      ++consumed;
+      if(UINTMAX_MAX / dv < mult){ // near overflow--can't scale dv again
+        break;
+      }
     }
   }
   if(dv != mult){ // if consumed == 0, dv must equal mult
@@ -51,29 +63,34 @@ const char *enmetric(uintmax_t val, unsigned decimal, char *buf, int omitdec,
     // 1,024). That can overflow with large 64-bit values, but we can first
     // divide both sides by mult, and then scale by 100.
     if(omitdec && (val % dv) == 0){
-      sprintfed = sprintf(buf, "%ju%c", val / dv,
-                          prefixes[consumed - 1]);
+      sprintfed = sprintf(buf, "%ju%c", val / dv, prefixes[consumed - 1]);
     }else{
       uintmax_t remain = (dv == mult) ?
                 (val % dv) * 100 / dv :
                 ((val % dv) / mult * 100) / (dv / mult);
-      sprintfed = sprintf(buf, "%ju%s%02ju%c",
-                          val / dv,
-                          decisep,
-                          remain,
+      sprintfed = sprintf(buf, "%ju%s%02ju%c", val / dv, decisep, remain,
                           prefixes[consumed - 1]);
     }
     if(uprefix){
       buf[sprintfed] = uprefix;
       buf[sprintfed + 1] = '\0';
     }
-  }else{ // unscaled output, consumed == 0, dv == mult
-    // val / decimal < dv (or we ran out of prefixes)
-    if(omitdec && val % decimal == 0){
-      sprintf(buf, "%ju", val / decimal);
+    return buf;
+  }
+  // unscaled output, consumed == 0, dv == mult
+  // val / decimal < dv (or we ran out of prefixes)
+  if(omitdec && val % decimal == 0){
+    if(consumed){
+      sprintf(buf, "%ju%c", val / decimal, subprefixes[consumed - 1]);
+    }else{
+      sprintf(buf, "%ju", val / decimal);
+    }
+  }else{
+    uintmax_t divider = (decimal > mult ? decimal / mult : 1) * 10;
+    uintmax_t remain = (val % decimal) / divider;
+    if(consumed){
+      sprintf(buf, "%ju%s%02ju%c", val / decimal, decisep, remain, subprefixes[consumed - 1]);
     }else{
-      uintmax_t divider = (decimal > mult ? decimal / mult : 1) * 10;
-      uintmax_t remain = (val % decimal) / divider;
       sprintf(buf, "%ju%s%02ju", val / decimal, decisep, remain);
     }
   }

src/lib/notcurses.c

@@ -498,11 +498,15 @@ interrogate_terminfo(notcurses* nc, const notcurses_options* opts){
   }
   nc->CCCflag = tigetflag("ccc") == 1;
   if((nc->colors = tigetnum("colors")) <= 0){
-    fprintf(stderr, "This terminal doesn't appear to support colors\n");
+    if(!opts->suppress_banner){
+      fprintf(stderr, "This terminal doesn't appear to support colors\n");
+    }
     nc->colors = 1;
   }else if(nc->RGBflag && (unsigned)nc->colors < (1u << 24u)){
-    fprintf(stderr, "Warning: advertised RGB flag but only %d colors\n",
-            nc->colors);
+    if(!opts->suppress_banner){
+      fprintf(stderr, "Warning: advertised RGB flag but only %d colors\n",
+              nc->colors);
+    }
   }
   term_verify_seq(&nc->cup, "cup");
   if(nc->cup == NULL){

tests/enmetric.cpp

@@ -325,7 +325,7 @@ TEST_CASE("Enmetric") {
   // computation of that output. For instance, we might feed a number of
   // nanoseconds, but want output in seconds.
   // This requires 'decimal' = 1000000000.
-  SUBCASE("ScaledGig") {
+  SUBCASE("ScaledGigSupra") {
     char gold[PREFIXSTRLEN + 1] = "9.02";
     char buf[PREFIXSTRLEN + 1];
     uintmax_t val = 9027854993;
@@ -334,4 +334,49 @@ TEST_CASE("Enmetric") {
     CHECK(!strcmp(buf, gold));
   }
 
+  SUBCASE("ScaledGigUnity") {
+    char gold[PREFIXSTRLEN + 1] = "1.00";
+    char buf[PREFIXSTRLEN + 1];
+    uintmax_t decimal = 1000000000;
+    uintmax_t val = decimal;
+    REQUIRE(qprefix(val, decimal, buf, 0));
+    CHECK(!strcmp(buf, gold));
+  }
+
+  SUBCASE("ScaledGigJustAbove") {
+    char gold[PREFIXSTRLEN + 1] = "1.00";
+    char buf[PREFIXSTRLEN + 1];
+    uintmax_t val = 1000000001;
+    uintmax_t decimal = 1000000000;
+    REQUIRE(qprefix(val, decimal, buf, 0));
+    CHECK(!strcmp(buf, gold));
+  }
+
+  SUBCASE("ScaledGigJustBelow") {
+    char gold[PREFIXSTRLEN + 1] = "999.99m";
+    char buf[PREFIXSTRLEN + 1];
+    uintmax_t val = 999999999;
+    uintmax_t decimal = 1000000000;
+    REQUIRE(qprefix(val, decimal, buf, 0));
+    CHECK(!strcmp(buf, gold));
+  }
+
+  SUBCASE("ScaledGigSub") {
+    char gold[PREFIXSTRLEN + 1] = "27.85m";
+    char buf[PREFIXSTRLEN + 1];
+    uintmax_t val = 27854993;
+    uintmax_t decimal = 1000000000;
+    REQUIRE(qprefix(val, decimal, buf, 0));
+    CHECK(!strcmp(buf, gold));
+  }
+
+  SUBCASE("ScaledGigSubSub") {
+    char gold[PREFIXSTRLEN + 1] = "7.85m";
+    char buf[PREFIXSTRLEN + 1];
+    uintmax_t val = 7854993;
+    uintmax_t decimal = 1000000000;
+    REQUIRE(qprefix(val, decimal, buf, 0));
+    CHECK(!strcmp(buf, gold));
+  }
+
 }