diff options
Diffstat (limited to 'tools/mkenvimage.c')
| -rw-r--r-- | tools/mkenvimage.c | 29 |
1 files changed, 22 insertions, 7 deletions
diff --git a/tools/mkenvimage.c b/tools/mkenvimage.c index 6971b91..8eee72e 100644 --- a/tools/mkenvimage.c +++ b/tools/mkenvimage.c @@ -214,14 +214,10 @@ int main(int argc, char **argv) } ret = close(txt_fd); } - /* The +1 is for the additionnal ending \0. See below. */ - if (filesize + 1 > envsize) { - fprintf(stderr, "The input file is larger than the environment partition size\n"); - return EXIT_FAILURE; - } - /* Replace newlines separating variables with \0 */ - for (fp = 0, ep = 0 ; fp < filesize ; fp++) { + /* Parse a byte at time until reaching the file OR until the environment fills + * up. Check ep against envsize - 1 to allow for extra trailing '\0'. */ + for (fp = 0, ep = 0 ; fp < filesize && ep < envsize - 1; fp++) { if (filebuf[fp] == '\n') { if (fp == 0 || filebuf[fp-1] == '\n') { /* @@ -249,6 +245,25 @@ int main(int argc, char **argv) envptr[ep++] = filebuf[fp]; } } + /* If there are more bytes in the file still, it means the env filled up + * before parsing the whole file. Eat comments & whitespace here to see if + * there was anything meaning full left in the file, and if so, throw a error + * and exit. */ + for( ; fp < filesize; fp++ ) + { + if (filebuf[fp] == '\n') { + if (fp == 0 || filebuf[fp-1] == '\n') { + /* Ignore blank lines */ + continue; + } + } else if ((fp == 0 || filebuf[fp-1] == '\n') && filebuf[fp] == '#') { + while (++fp < filesize && filebuf[fp] != '\n') + continue; + } else { + fprintf(stderr, "The environment file is too large for the target environment storage\n"); + return EXIT_FAILURE; + } + } /* * Make sure there is a final '\0' * And do it again on the next byte to mark the end of the environment. |