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author | Andrew Tridgell <tridge@samba.org> | 2013-02-18 10:19:38 +1100 |
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committer | Andrew Tridgell <tridge@samba.org> | 2013-02-18 10:19:38 +1100 |
commit | 1670b8afe13ba6c845800228d1c8829aa1bf31c9 (patch) | |
tree | 1dc66cb870de469ff252687d0f209def425d177c /apps/nshlib/nsh_fscmds.c | |
parent | 9b7ee0c91b978ffd897e45366050ce8faf02606f (diff) | |
download | px4-firmware-1670b8afe13ba6c845800228d1c8829aa1bf31c9.tar.gz px4-firmware-1670b8afe13ba6c845800228d1c8829aa1bf31c9.tar.bz2 px4-firmware-1670b8afe13ba6c845800228d1c8829aa1bf31c9.zip |
nshlib: added cmp command to nsh
this is useful for startup scripts testing for auto-upgrade of add-on
board firmware
Diffstat (limited to 'apps/nshlib/nsh_fscmds.c')
-rw-r--r-- | apps/nshlib/nsh_fscmds.c | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/apps/nshlib/nsh_fscmds.c b/apps/nshlib/nsh_fscmds.c index f47dca896..83717e416 100644 --- a/apps/nshlib/nsh_fscmds.c +++ b/apps/nshlib/nsh_fscmds.c @@ -1232,3 +1232,84 @@ int cmd_sh(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv) } #endif #endif + + +#if CONFIG_NFILE_DESCRIPTORS > 0 +#ifndef CONFIG_NSH_DISABLE_CMP +int cmd_cmp(FAR struct nsh_vtbl_s *vtbl, int argc, char **argv) +{ + char *path1 = NULL; + char *path2 = NULL; + int fd1 = -1, fd2 = -1; + int ret = ERROR; + unsigned total_read = 0; + + /* Get the full path to the two files */ + + path1 = nsh_getfullpath(vtbl, argv[1]); + if (!path1) + { + goto errout; + } + + path2 = nsh_getfullpath(vtbl, argv[2]); + if (!path2) + { + goto errout; + } + + /* Open the files for reading */ + fd1 = open(path1, O_RDONLY); + if (fd1 < 0) + { + nsh_output(vtbl, g_fmtcmdfailed, argv[0], "open", NSH_ERRNO); + goto errout; + } + + fd2 = open(path2, O_RDONLY); + if (fd2 < 0) + { + nsh_output(vtbl, g_fmtcmdfailed, argv[0], "open", NSH_ERRNO); + goto errout; + } + + for (;;) + { + char buf1[128]; + char buf2[128]; + + int nbytesread1 = read(fd1, buf1, sizeof(buf1)); + int nbytesread2 = read(fd2, buf2, sizeof(buf2)); + + if (nbytesread1 < 0) + { + nsh_output(vtbl, g_fmtcmdfailed, argv[0], "read", NSH_ERRNO); + goto errout; + } + + if (nbytesread2 < 0) + { + nsh_output(vtbl, g_fmtcmdfailed, argv[0], "read", NSH_ERRNO); + goto errout; + } + + total_read += nbytesread1>nbytesread2?nbytesread2:nbytesread1; + + if (nbytesread1 != nbytesread2 || memcmp(buf1, buf2, nbytesread1) != 0) + { + nsh_output(vtbl, "files differ: byte %u\n", total_read); + goto errout; + } + + if (nbytesread1 < sizeof(buf1)) break; + } + + ret = OK; + +errout: + if (fd1 != -1) close(fd1); + if (fd2 != -1) close(fd2); + return ret; +} +#endif +#endif |