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comm: close a race condition when comm is fed from stdin
If one of the files has ended, we won't show the column, but we still need to drain the file pointer to avoid potentially hitting a pipe failure. This commit moves the NULL offset checks inside show() so that getline() and ferror() are still called on fp. Reviewed by: allanjude Sponsored by: Apple Inc. Differential Revision: https://reviews.freebsd.org/D45440
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@ -129,12 +129,12 @@ main(int argc, char *argv[])
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/* if one file done, display the rest of the other file */
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if (n1 < 0) {
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if (n2 >= 0 && col2 != NULL)
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if (n2 >= 0)
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show(fp2, argv[1], col2, &line2, &line2len);
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break;
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}
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if (n2 < 0) {
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if (n1 >= 0 && col1 != NULL)
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if (n1 >= 0)
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show(fp1, argv[0], col1, &line1, &line1len);
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break;
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}
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@ -206,10 +206,12 @@ show(FILE *fp, const char *fn, const char *offset, char **bufp, size_t *buflenp)
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ssize_t n;
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do {
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(void)printf("%s%s\n", offset, *bufp);
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/* offset is NULL when draining fp, not printing */
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if (offset != NULL)
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(void)printf("%s%s\n", offset, *bufp);
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if ((n = getline(bufp, buflenp, fp)) < 0)
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break;
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if (n > 0 && (*bufp)[n - 1] == '\n')
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if (n > 0 && offset != NULL && (*bufp)[n - 1] == '\n')
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(*bufp)[n - 1] = '\0';
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} while (1);
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if (ferror(fp))
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