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From: peturr02@ru.is To: gcc-gnats@gcc.gnu.org Subject: libstdc++/9825: filebuf::sputbackc breaks sbumpc Date: Mon, 24 Feb 2003 09:16:00 -0000 [thread overview] Message-ID: <20030224091251.4245.qmail@sources.redhat.com> (raw) >Number: 9825 >Category: libstdc++ >Synopsis: filebuf::sputbackc breaks sbumpc >Confidential: no >Severity: serious >Priority: medium >Responsible: unassigned >State: open >Class: sw-bug >Submitter-Id: net >Arrival-Date: Mon Feb 24 09:16:01 UTC 2003 >Closed-Date: >Last-Modified: >Originator: peturr02@ru.is >Release: gcc-3.2.1 >Organization: >Environment: Red Hat Linux 8.0 >Description: Given the following: filebuf fb; [...] fb.sputbackc('x'); fb.sbumpc(); fb.sbumpc(); // 1 fb.sbumpc(); // 2 The sbumpc in line 1 doesn't advance the read position, causing the sbumpc in line 2 to return the same character, instead of the next one. >How-To-Repeat: See attachment. >Fix: >Release-Note: >Audit-Trail: >Unformatted: ----gnatsweb-attachment---- Content-Type: text/plain; name="uflowbug.cc" Content-Disposition: inline; filename="uflowbug.cc" #include <fstream> #include <cstdio> #undef NDEBUG #include <cassert> int main() { using namespace std; const char* str = "0123456789"; FILE* fout = fopen("tmp", "w"); fputs(str, fout); fclose(fout); filebuf fbuf; fbuf.open("tmp", ios_base::in); fbuf.sbumpc(); fbuf.sputbackc('x'); int c = fbuf.sbumpc(); assert(c == 'x'); c = fbuf.sbumpc(); assert(c == '1'); c = fbuf.sbumpc(); assert(c == '2'); fbuf.close(); return 0; }
next reply other threads:[~2003-02-24 9:16 UTC|newest] Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top 2003-02-24 9:16 peturr02 [this message] 2003-02-24 13:23 paolo 2003-02-25 12:40 paolo
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