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comparison packages/io/common/current/src/iosys.c @ 1595:05e490add1fb

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* src/iosys.c (cyg_io_lookup): Use union to avoid aliasing problems with compiler.
author jlarmour
date Fri, 16 Apr 2004 03:33:40 +0000
parents d2c90368aeef
children
comparison
equal deleted inserted replaced
1594:edb4ac2e0d6b 1595:05e490add1fb
122 // 122 //
123 123
124 Cyg_ErrNo 124 Cyg_ErrNo
125 cyg_io_lookup(const char *name, cyg_io_handle_t *handle) 125 cyg_io_lookup(const char *name, cyg_io_handle_t *handle)
126 { 126 {
127 cyg_devtab_entry_t *t, *st; 127 union devtab_entry_handle_union {
128 cyg_devtab_entry_t *st;
129 cyg_io_handle_t h;
130 } stunion;
131 cyg_devtab_entry_t *t;
128 Cyg_ErrNo res; 132 Cyg_ErrNo res;
129 const char *name_ptr; 133 const char *name_ptr;
130 for (t = &__DEVTAB__[0]; t != &__DEVTAB_END__; t++) { 134 for (t = &__DEVTAB__[0]; t != &__DEVTAB_END__; t++) {
131 if (cyg_io_compare(name, t->name, &name_ptr)) { 135 if (cyg_io_compare(name, t->name, &name_ptr)) {
132 // FUTURE: Check 'avail'/'online' here 136 // FUTURE: Check 'avail'/'online' here
133 if (t->dep_name) { 137 if (t->dep_name) {
134 res = cyg_io_lookup(t->dep_name, (cyg_io_handle_t *)&st); 138 res = cyg_io_lookup(t->dep_name, &stunion.h);
135 if (res != ENOERR) { 139 if (res != ENOERR) {
136 return res; 140 return res;
137 } 141 }
138 } else { 142 } else {
139 st = (cyg_devtab_entry_t *)0; 143 stunion.st = NULL;
140 } 144 }
141 if (t->lookup) { 145 if (t->lookup) {
142 // This indirection + the name pointer allows the lookup routine 146 // This indirection + the name pointer allows the lookup routine
143 // to return a different 'devtab' handle. This will provide for 147 // to return a different 'devtab' handle. This will provide for
144 // 'pluggable' devices, file names, etc. 148 // 'pluggable' devices, file names, etc.
145 res = (t->lookup)(&t, st, name_ptr); 149 res = (t->lookup)(&t, stunion.st, name_ptr);
146 if (res != ENOERR) { 150 if (res != ENOERR) {
147 return res; 151 return res;
148 } 152 }
149 } 153 }
150 *handle = (cyg_io_handle_t)t; 154 *handle = (cyg_io_handle_t)t;