diff --git a/src/qmdoc/qmdoc.c b/src/qmdoc/qmdoc.c
index 8f0fd23..38863f1 100644
--- a/src/qmdoc/qmdoc.c
+++ b/src/qmdoc/qmdoc.c
@@ -9,11 +9,11 @@
 #include <time.h>
 #include <getopt.h>
 #include <errno.h>
-#include <skalibs/buffer.h>
-#include <skalibs/djbunix.h>
-#include <skalibs/unix-transactional.h>
-#include <skalibs/uint32.h>
+#include <limb/buffer.h>
+#include <limb/djbunix.h>
+#include <limb/exitcode.h>
 #include <limb/output.h>
+#include <limb/u32.h>
 #include <limb/unix-transactional.h>
 #include "md4c.h"
 #include "qmdoc.h"
@@ -518,8 +518,8 @@ enter_block(MD_BLOCKTYPE type, void *details, void *ctx_)
         case MD_BLOCK_OL:
             {
                 MD_BLOCK_OL_DETAIL *d = details;
-                char buf[UINT32_FMT];
-                buf[uint32_fmt(buf, d->start)] = 0;
+                char buf[U32_FMT];
+                buf[u32_fmt(buf, d->start)] = 0;
 
                 if (!raw_str(ctx, "<ol")
                         || (d->start >= 0 && (!raw_str(ctx, " start=")
@@ -665,12 +665,12 @@ leave_block(MD_BLOCKTYPE type, void *details, void *ctx_)
             ;
             struct page *p = &ctx->pages[ctx->cur_page];
 
-            char year[UINT32_FMT];
+            char year[U32_FMT];
             struct timespec ts;
             clock_gettime(CLOCK_REALTIME, &ts);
             struct tm tm;
             localtime_r(&ts.tv_sec, &tm);
-            year[uint32_fmt(year, (uint32) 1900 + tm.tm_year)] = '\0';
+            year[u32_fmt(year, (u32) 1900 + tm.tm_year)] = '\0';
             if ((ctx->doc.flags & DOC_HAS_TITLE) && !raw_str(ctx, "</section>"))
                 return ERR_PARSER_LEAVE_BLOCK;
             if (p->nameoff) {
@@ -771,8 +771,8 @@ leave_block(MD_BLOCKTYPE type, void *details, void *ctx_)
 
                 BUFFERING_OFF(s, l);
 
-                char buf[UINT32_FMT];
-                buf[uint32_fmt(buf, (uint32) ctx->title.level)] = '\0';
+                char buf[U32_FMT];
+                buf[u32_fmt(buf, (u32) ctx->title.level)] = '\0';
 
                 if (!raw_str(ctx, "<section id=\"")
                         || !anchor(ctx, s, l)
@@ -836,8 +836,8 @@ leave_block(MD_BLOCKTYPE type, void *details, void *ctx_)
                             if (!e) break;
                             l -= ++e - s;
                             s = e;
-                            char buf[UINT32_FMT];
-                            buf[uint32_fmt(buf, (uint32) n)] = '\0';
+                            char buf[U32_FMT];
+                            buf[u32_fmt(buf, (u32) n)] = '\0';
                             if (!raw_str(ctx, buf) || !raw_str(ctx, "\n"))
                                 return ERR_PARSER_BUFFERED;
                         }
@@ -1025,10 +1025,10 @@ leave_span(MD_SPANTYPE type, void *details, void *ctx_)
                     if (section < 0)
                         return ERR_PARSER_LEAVE_SPAN;
 
-                    char buf[UINT32_FMT + 2];
+                    char buf[U32_FMT + 2];
                     int e;
                     buf[0] = '(';
-                    e = uint32_fmt(buf + 1, (uint32) section);
+                    e = u32_fmt(buf + 1, (u32) section);
                     buf[1 + e] = ')';
                     buf[2 + e] = '\0';
 
@@ -1257,8 +1257,8 @@ convert_page(struct ctx *ctx, int fddest)
     };
     int r = md_parse(sce, p->size, &parser, ctx);
     if (r != 0) {
-        char buf[UINT32_FMT];
-        buf[uint32_fmt(buf, (uint32) (r < 0) ? -r : r)] = '\0';
+        char buf[U32_FMT];
+        buf[u32_fmt(buf, (u32) (r < 0) ? -r : r)] = '\0';
         retw(ERR_PARSER, (r < 0) ? "parser internal error " : "parser error ", buf);
     }
 
@@ -1267,8 +1267,8 @@ convert_page(struct ctx *ctx, int fddest)
         ctx->doc.flags |= DOC_BUFFERING;
         for ( ; ctx->toc_lvl > 0; --ctx->toc_lvl) {
             if (!raw_str(ctx, "</ul>")) {
-                char buf[UINT32_FMT];
-                buf[uint32_fmt(buf, (uint32) ERR_PARSER_TOC)] = '\0';
+                char buf[U32_FMT];
+                buf[u32_fmt(buf, (u32) ERR_PARSER_TOC)] = '\0';
                 retw(ERR_PARSER, "parser internal error ", buf);
             }
         }
@@ -1322,14 +1322,14 @@ load_page_from_file(const char *file, struct page *page, stralloc *sa)
     page->fileoff = sa->len;
     if (!stralloc_catb(sa, page->sce, l - 2)
             || !stralloc_catb(sa, "html", 5))
-        retwusys(ERR_MEM, "load page title from '", file, "'");
+        retwusys(EX_TEMPFAIL, "load page title from '", file, "'");
 
     char buf_[256], buf[sizeof(buf_)];
     buffer buffer = BUFFER_INIT(&fd_readv, page->fd, buf_, sizeof(buf_));
 
     ssize_t left = buffer_get(&buffer, buf, sizeof(buf));
     if (left <= 0)
-        retwu(ERR_IO, "load page title from '", file, "'");
+        retwu(EX_IOERR, "load page title from '", file, "'");
 
     page->titleoff = page->fileoff;
 
@@ -1367,7 +1367,7 @@ load_page_from_file(const char *file, struct page *page, stralloc *sa)
                     && (!stralloc_catb(sa, b + ((is_hdr) ? 2 : 0),
                                        ((e) ? e - b : left) - ((is_hdr) ? 2 : 0))
                         || (e && !stralloc_0(sa))))
-                retwusys(ERR_MEM, "load page title from '", file, "'");
+                retwusys(EX_TEMPFAIL, "load page title from '", file, "'");
         }
         if (e) {
             int l = e - b + 1;
@@ -1383,7 +1383,7 @@ load_page_from_file(const char *file, struct page *page, stralloc *sa)
             b = buf;
             left = buffer_get(&buffer, buf, sizeof(buf));
             if (left <= 0)
-                retwusys(ERR_IO, "load page title from '", file, "'");
+                retwusys(EX_IOERR, "load page title from '", file, "'");
             if (!e) begin = 0;
         }
     }
@@ -1403,7 +1403,7 @@ load_page_from_file(const char *file, struct page *page, stralloc *sa)
 
     page->size = lseek(page->fd, 0, SEEK_END);
     if (page->size == (off_t) -1 || lseek(page->fd, done, SEEK_SET) < 0)
-        retwusys(ERR_MEM, "seek into '", file, "'");
+        retwusys(EX_IOERR, "seek into '", file, "'");
     page->size -= done;
     return 0;
 }
@@ -1547,12 +1547,12 @@ main (int argc, char *argv[])
     }
     if (optind == argc) usage(1);
     if ((ctx.options & (OPT_NO_CSS | OPT_INLINE_CSS)) == (OPT_NO_CSS | OPT_INLINE_CSS))
-        dief(-ERR_USAGE, "cannot use '", "--no-css", "' and '", "--inline-css", "' together");
+        dief(EX_USAGE, "cannot use '", "--no-css", "' and '", "--inline-css", "' together");
     if ((ctx.options & (OPT_INDEX | OPT_NO_INDEX)) == (OPT_INDEX | OPT_NO_INDEX))
-        dief(-ERR_USAGE, "cannot use '", "--index", "' and '", "--no-index", "' together");
+        dief(EX_USAGE, "cannot use '", "--index", "' and '", "--no-index", "' together");
 
     int fddest = open(destdir, O_RDONLY | O_DIRECTORY | O_CLOEXEC);
-    if (fddest < 0) diefusys(-ERR_IO, "open '", destdir, "'");
+    if (fddest < 0) diefusys(EX_IOERR, "open '", destdir, "'");
 
     if (!(ctx.options & OPT_NO_TOC)) css[CSS_NO_TOC].file = NULL;
 
@@ -1572,19 +1572,19 @@ main (int argc, char *argv[])
         if (strcmp(file + len - 3, ".md")) {
             warn("File '", file, "' not a markdown file (*.md)");
             pages[i - optind].fd = -1;
-            err = ERR_MISC;
+            err = EX_DATA_ERR;
             continue;
         }
 
         int r = load_page_from_file(file, &pages[i - optind], &ctx.sa);
-        if (r < 0) err = r;
+        if (r) err = r;
 
         if (!(ctx.options & OPT_NO_INDEX)
                 && !strcmp(ctx.sa.s + pages[i - optind].fileoff, "index.html"))
             idx_page = i - optind;
     }
 
-    if (err < 0) diefu(-err, "load pages");
+    if (err) diefu(err, "load pages");
 
     /* enable FULL TOC unless disabled (OPT_NO_INDEX) if:
      * - index was given as first page, or none given (add our internal tpl),
@@ -1600,12 +1600,12 @@ main (int argc, char *argv[])
             /* add our internal index */
             pages[0].sce = "<internal index>";
             pages[0].fileoff = ctx.sa.len;
-            if (!stralloc_catb(&ctx.sa, "index.html", strlen("index.html") + 1))
-                diefusys(-ERR_MEM, "load page title from '", pages[0].sce, "'");
+            if (!stralloc_cats0(&ctx.sa, "index.html"))
+                diefusys(EX_TEMPFAIL, "load page title from '", pages[0].sce, "'");
 
             pages[0].titleoff = ctx.sa.len;
-            if (!stralloc_catb(&ctx.sa, index_title, strlen(index_title) + 1))
-                diefusys(-ERR_MEM, "load page title from '", pages[0].sce, "'");
+            if (!stralloc_cats0(&ctx.sa, index_title))
+                diefusys(EX_TEMPFAIL, "load page title from '", pages[0].sce, "'");
 
             /* fd == -1 means use index_md instead of reading from fd */
             pages[0].fd = -1;
@@ -1629,12 +1629,12 @@ main (int argc, char *argv[])
         if (header) {
             ctx.doc.oheader = ctx.sa.len;
             if (!openreadfileclose(header, &ctx.sa, 0) || !stralloc_0(&ctx.sa))
-                diefusys(-ERR_IO, "load data from '", header, "'");
+                diefusys(EX_IOERR, "load data from '", header, "'");
         }
         if (footer) {
             ctx.doc.ofooter = ctx.sa.len;
             if (!openreadfileclose(footer, &ctx.sa, 0) || !stralloc_0(&ctx.sa))
-                diefusys(-ERR_IO, "load data from '", footer, "'");
+                diefusys(EX_IOERR, "load data from '", footer, "'");
         }
     }
 
@@ -1655,7 +1655,8 @@ main (int argc, char *argv[])
                 css[i].offset = ctx.sa.len;
                 if (!openreadfileclose(file, &ctx.sa, 0)
                         || !stralloc_0(&ctx.sa))
-                    diefusys(-ERR_IO, "load CSS from '", file, "'");
+                    diefusys((errno == ENOMEM) ? EX_TEMPFAIL : EX_IOERR,
+                             "load CSS from '", file, "'");
             } else {
                 int from, to;
                 from = open_read(file);
@@ -1666,7 +1667,7 @@ main (int argc, char *argv[])
                     to = open_exclat(fddest, css[i].file);
                 if (to < 0) diefusys(-ERR_IO, "create '", destdir, "/", css[i].file, "'");
                 if (fd_cat(from, to) < 0)
-                    diefusys(-ERR_IO, "copy CSS to '", destdir, "/", css[i].file, "'");
+                    diefusys(EX_IOERR, "copy CSS to '", destdir, "/", css[i].file, "'");
                 fd_close(from);
                 fd_close(to);
             }