cursor: check return value of snprintf()
Fixes a new warning in GCC 7:
FAILED: cursor/libwayland-cursor.so.0.22.90.p/xcursor.c.o
cc -Icursor/libwayland-cursor.so.0.22.90.p -Icursor -I../cursor -I. -I.. -Isrc -I../src -fdiagnostics-color=always -pipe -D_FILE_OFFSET_BITS=64 -Wall -Winvalid-pch -Wextra -Werror -std=c99 -O3 -D_POSIX_C_SOURCE=200809L -Wno-unused-parameter -Wstrict-prototypes -Wmissing-prototypes -fvisibility=hidden -fPIC '-DICONDIR="/usr/share/X11/icons"' -MD -MQ cursor/libwayland-cursor.so.0.22.90.p/xcursor.c.o -MF cursor/libwayland-cursor.so.0.22.90.p/xcursor.c.o.d -o cursor/libwayland-cursor.so.0.22.90.p/xcursor.c.o -c ../cursor/xcursor.c
../cursor/xcursor.c: In function 'xcursor_load_theme':
../cursor/xcursor.c:596:39: error: '%s' directive output between 7 and 7 bytes may cause result to exceed 'INT_MAX' [-Werror=format-truncation=]
596 | snprintf(full, full_size, "%s/%s/%s", dir, subdir, file);
| ^~
......
764 | full = xcursor_build_fullname(dir, "cursors", "");
| ~~~~~~~~~
../cursor/xcursor.c:596:41: error: '/' directive output between 1 and 1 bytes may cause result to exceed 'INT_MAX' [-Werror=format-truncation=]
596 | snprintf(full, full_size, "%s/%s/%s", dir, subdir, file);
| ^
cc1: all warnings being treated as errors
Signed-off-by: Simon Ser <contact@emersion.fr>
7b27881cd1