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Fixes #33: Remove invalid use of strncpy().

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This was causing a stringop-truncation compiler warning in gcc 8 when
the #defined values being copied from were string literals.
 `error: 'strncpy' output truncated before terminating nul copying 8 bytes from a string of the same length [-Werror=stringop-truncation]`

These fields aren't NUL terminated C strings, they are a fixed width buffer
that is supposed to be space (0x20) padded.
This commit is contained in:
Gregory P. Smith 2019-03-03 19:41:41 -08:00
parent 55874813f8
commit fa8141f31f
1 changed files with 12 additions and 6 deletions
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18
src/class/msc/msc_device.c
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@ -265,14 +265,20 @@ int32_t proc_builtin_scsi(msc_cbw_t const * p_cbw, uint8_t* buffer, uint32_t buf
.is_removable = 1,
.version = 2,
.response_data_format = 2,
.vendor_id = "Adafruit",
.product_id = "Feather52840",
.product_rev = "1.0"
.vendor_id = " ",
.product_id = " ",
.product_rev = " ",
};
size_t len;
strncpy((char*) inquiry_rsp.vendor_id , CFG_TUD_MSC_VENDOR , sizeof(inquiry_rsp.vendor_id));
strncpy((char*) inquiry_rsp.product_id , CFG_TUD_MSC_PRODUCT , sizeof(inquiry_rsp.product_id));
strncpy((char*) inquiry_rsp.product_rev, CFG_TUD_MSC_PRODUCT_REV, sizeof(inquiry_rsp.product_rev));
#define _min(a,b) ((a) < (b) ? (a) : (b))
len = strlen(CFG_TUD_MSC_VENDOR);
memcpy(inquiry_rsp.vendor_id , CFG_TUD_MSC_VENDOR , _min(len, sizeof(inquiry_rsp.vendor_id)));
len = strlen(CFG_TUD_MSC_PRODUCT);
memcpy(inquiry_rsp.product_id , CFG_TUD_MSC_PRODUCT , _min(len, sizeof(inquiry_rsp.product_id)));
len = strlen(CFG_TUD_MSC_PRODUCT_REV);
memcpy(inquiry_rsp.product_rev, CFG_TUD_MSC_PRODUCT_REV, _min(len, sizeof(inquiry_rsp.product_rev)));
#undef _min
ret = sizeof(inquiry_rsp);
memcpy(buffer, &inquiry_rsp, ret);