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improve stream read and write error handling - stagit-gopher - static git page generator for gopher |
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git clone git://git.codemadness.org/stagit-gopher (git://git.codemadness.org) |
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Log |
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Files |
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Refs |
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README |
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LICENSE |
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--- |
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commit cbb963db3795ea24cd0d68f73b415f9fc48922cc |
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parent 1dd611d990843966e50b23dac30617d6aa5b2b2e |
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Author: Hiltjo Posthuma <hiltjo@codemadness.org> (mailto://) |
application/vnd.lotus-organizer |
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Date: Sat, 19 Mar 2022 12:51:57 +0100 |
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improve stream read and write error handling |
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Diffstat: |
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M stagit-gopher-index.c | 13 +++++++++++++ |
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M stagit-gopher.c | 35 ++++++++++++++++++++++++------- |
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2 files changed, 40 insertions(+), 8 deletions(-) |
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--- |
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diff --git a/stagit-gopher-index.c b/stagit-gopher-index.c |
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@@ -20,6 +20,16 @@ static const char *relpath = ""; |
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static char description[255] = "Repositories"; |
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static char *name = ""; |
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+/* Handle read or write errors for a FILE * stream */ |
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+void |
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+checkfileerror(FILE *fp, const char *name, int mode) |
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+{ |
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+ if (mode == 'r' && ferror(fp)) |
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+ errx(1, "read error: %s", name); |
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+ else if (mode == 'w' && (fflush(fp) || ferror(fp))) |
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+ errx(1, "write error: %s", name); |
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+} |
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+ |
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/* Format `len' columns of characters. If string is shorter pad the rest |
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* with characters `pad`. */ |
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int |
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@@ -289,6 +299,7 @@ main(int argc, char *argv[]) |
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description[strcspn(description, "\t\r\n")] = '\0'; |
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else |
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description[0] = '\0'; |
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+ checkfileerror(fp, "description", 'r'); |
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fclose(fp); |
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} |
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@@ -303,5 +314,7 @@ main(int argc, char *argv[]) |
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git_repository_free(repo); |
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git_libgit2_shutdown(); |
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+ checkfileerror(stdout, "<stdout>", 'w'); |
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+ |
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return ret; |
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} |
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diff --git a/stagit-gopher.c b/stagit-gopher.c |
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@@ -83,6 +83,16 @@ static char lastoidstr[GIT_OID_HEXSZ + 2]; /* id + newline + NUL byte */ |
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static FILE *rcachefp, *wcachefp; |
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static const char *cachefile; |
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+/* Handle read or write errors for a FILE * stream */ |
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+void |
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+checkfileerror(FILE *fp, const char *name, int mode) |
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+{ |
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+ if (mode == 'r' && ferror(fp)) |
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+ errx(1, "read error: %s", name); |
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+ else if (mode == 'w' && (fflush(fp) || ferror(fp))) |
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+ errx(1, "write error: %s", name); |
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+} |
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+ |
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/* Format `len' columns of characters. If string is shorter pad the rest |
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* with characters `pad`. */ |
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int |
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@@ -878,6 +888,7 @@ writelog(FILE *fp, const git_oid *oid) |
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writeheader(fpfile, ci->summary); |
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printshowfile(fpfile, ci); |
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writefooter(fpfile); |
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+ checkfileerror(fpfile, path, 'w'); |
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fclose(fpfile); |
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} |
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err: |
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@@ -1018,14 +1029,13 @@ writeblob(git_object *obj, const char *fpath, const char *filename, size_t files |
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fprintf(fp, " (%zuB)\n", filesize); |
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fputs("---\n", fp); |
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- if (git_blob_is_binary((git_blob *)obj)) { |
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+ if (git_blob_is_binary((git_blob *)obj)) |
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fputs("Binary file.\n", fp); |
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- } else { |
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+ else |
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lc = writeblobgph(fp, (git_blob *)obj); |
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- if (ferror(fp)) |
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- err(1, "fwrite"); |
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- } |
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+ |
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writefooter(fp); |
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+ checkfileerror(fp, fpath, 'w'); |
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fclose(fp); |
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return lc; |
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@@ -1337,6 +1347,7 @@ main(int argc, char *argv[]) |
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if (fpread) { |
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if (!fgets(description, sizeof(description), fpread)) |
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description[0] = '\0'; |
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+ checkfileerror(fpread, path, 'r'); |
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fclose(fpread); |
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} |
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@@ -1349,8 +1360,9 @@ main(int argc, char *argv[]) |
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if (fpread) { |
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if (!fgets(cloneurl, sizeof(cloneurl), fpread)) |
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cloneurl[0] = '\0'; |
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- cloneurl[strcspn(cloneurl, "\n")] = '\0'; |
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+ checkfileerror(fpread, path, 'r'); |
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fclose(fpread); |
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+ cloneurl[strcspn(cloneurl, "\n")] = '\0'; |
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} |
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/* check LICENSE */ |
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@@ -1408,13 +1420,15 @@ main(int argc, char *argv[]) |
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while (!feof(rcachefp)) { |
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n = fread(buf, 1, sizeof(buf), rcachefp); |
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if (ferror(rcachefp)) |
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- err(1, "fread"); |
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+ break; |
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if (fwrite(buf, 1, n, fp) != n || |
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fwrite(buf, 1, n, wcachefp) != n) |
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- err(1, "fwrite"); |
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+ break; |
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} |
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+ checkfileerror(rcachefp, cachefile, 'r'); |
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fclose(rcachefp); |
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} |
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+ checkfileerror(wcachefp, tmppath, 'w'); |
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fclose(wcachefp); |
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} else { |
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if (head) |
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@@ -1424,6 +1438,7 @@ main(int argc, char *argv[]) |
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fprintf(fp, "[0|Atom feed|%s/atom.xml|server|port]\n", relpath); |
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fprintf(fp, "[0|Atom feed (tags)|%s/tags.xml|server|port]\n", relpath); |
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writefooter(fp); |
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+ checkfileerror(fp, "log.gph", 'w'); |
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fclose(fp); |
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/* files for HEAD */ |
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@@ -1432,6 +1447,7 @@ main(int argc, char *argv[]) |
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if (head) |
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writefiles(fp, head); |
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writefooter(fp); |
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+ checkfileerror(fp, "files.gph", 'w'); |
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fclose(fp); |
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/* summary page with branches and tags */ |
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@@ -1439,16 +1455,19 @@ main(int argc, char *argv[]) |
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writeheader(fp, "Refs"); |
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writerefs(fp); |
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writefooter(fp); |
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+ checkfileerror(fp, "refs.gph", 'w'); |
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fclose(fp); |
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/* Atom feed */ |
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fp = efopen("atom.xml", "w"); |
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writeatom(fp, 1); |
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+ checkfileerror(fp, "atom.xml", 'w'); |
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fclose(fp); |
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/* Atom feed for tags / releases */ |
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fp = efopen("tags.xml", "w"); |
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writeatom(fp, 0); |
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+ checkfileerror(fp, "tags.xml", 'w'); |
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fclose(fp); |
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/* rename new cache file on success */ |
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