ubase

suckless linux base utils
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commit 84467fe733a0df879554d459e13b2399c7f77263
parent c116687c1d6d033009165371b7215e6b50ecdb40
Author: Eivind Uggedal <eivind@uggedal.com>
Date:   Wed Mar 16 09:23:50 +0000

dd: implement conv=notrunc support

Diffstat:
dd.1 | 2++
dd.c | 11+++++++----
2 files changed, 9 insertions(+), 4 deletions(-)
diff --git a/dd.1 b/dd.1 @@ -61,4 +61,6 @@ blocks from the beginning of the output before copying. Skip .Ar N blocks from the beginning of the input before copying. +.It Ar conv=notrunc +Do not truncate the output file. .El diff --git a/dd.c b/dd.c @@ -32,7 +32,7 @@ struct dd_config { uint64_t skip, seek, count, b_in, b_out, rec_in, rec_out; off_t fsize; blksize_t bs; - char quiet, nosync, direct; + char quiet, nosync, notrunc, direct; time_t t_start, t_end; }; @@ -99,7 +99,7 @@ prepare_copy(struct dd_config *ddc, int *ifd, int *ofd) return -1; } - if (!ddc->seek) + if (!ddc->seek && !ddc->notrunc) flo |= O_TRUNC; if (!ddc->out) *ofd = 1; @@ -108,7 +108,7 @@ prepare_copy(struct dd_config *ddc, int *ifd, int *ofd) return -1; } - if (ddc->seek) { + if (ddc->seek && !ddc->notrunc) { if (fstat(*ofd, &st) < 0) return -1; if (!S_ISREG(st.st_mode)) @@ -238,7 +238,8 @@ static void usage(void) { eprintf("usage: %s [-h] [if=infile] [of=outfile] [bs[=N]] [seek=N] " - "[skip=N] [count=N] [direct] [quiet] [nosync]\n", argv0); + "[skip=N] [count=N] [direct] [quiet] [nosync]" + "[conv=notrunc]\n", argv0); } int @@ -278,6 +279,8 @@ main(int argc, char *argv[]) config.quiet = 1; else if (strcmp(argv[i], "nosync") == 0) config.nosync = 1; + else if (strcmp(argv[i], "conv=notrunc") == 0) + config.notrunc = 1; else if (strcmp(argv[i], "-h") == 0) usage(); }