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platform/trivial: add code comment to NMP_SYSCTL_PATHID_NETDIR_A()

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Thomas Haller 2023-06-26 15:07:31 +02:00
parent f727c233c4
commit 0505a1fc52
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1 changed files with 7 additions and 0 deletions
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7
src/libnm-platform/nm-platform.h
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@ -1534,6 +1534,12 @@ const char *nm_link_type_to_string(NMLinkType link_type);
#define NMP_SYSCTL_PATHID_ABSOLUTE(path) ((const char *) NULL), -1, (path)
/* Uses alloca(). Use with care.
*
* Like NMP_SYSCTL_PATHID_NETDIR_A(), but "path" must not be a string literal.
* This is the "UNSAFE" part, where there is no compile time check for the
* maximum string length. It still must be reasonably short to not overflow
* the stack (the runtime assert checks for <200 chars). */
#define NMP_SYSCTL_PATHID_NETDIR_UNSAFE_A(dirfd, ifname, path) \
nm_sprintf_buf_unsafe_a(NM_STRLEN("net:/sys/class/net//\0") + NM_IFNAMSIZ + ({ \
const gsize _l = strlen(path); \
@ -1546,6 +1552,7 @@ const char *nm_link_type_to_string(NMLinkType link_type);
(path)), \
(dirfd), (path)
/* Uses alloca(). Use with care. */
#define NMP_SYSCTL_PATHID_NETDIR_A(dirfd, ifname, path) \
nm_sprintf_bufa(NM_STRLEN("net:/sys/class/net//" path "/\0") + NM_IFNAMSIZ, \
"net:/sys/class/net/%s/%s", \