FreeCalypso > hg > freecalypso-tools

annotate target-utils/libcommon/cmd_r16.c @ 965:2969032bdfac

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fcup-smsend[mult]: fix buglet in K&R C NULL pointer passing The only 100% safe way to pass a NULL pointer as a function argument in K&R C is to cast 0 to a pointer type; failing to do so may cause mysterious bugs (invalid stack frames or garbage in argument registers) on 64-bit machines. This issue has already been fixed in most of FC host tools, but I just found some missed spots: passing of NULL UDH to PDU encoding functions in fcup-smsend[mult] in the case of single (not concatenated) SMS.
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 01 Sep 2023 07:33:51 +0000
parents e7502631a0f9
children
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1 /*
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2 * r16 hexaddr -- read a 16-bit register or memory location
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3 */
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4
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5 #include <sys/types.h>
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6 #include "types.h"
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7
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8 void
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9 cmd_r16(argbulk)
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10 char *argbulk;
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11 {
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12 char *argv[2];
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13 u_long addr;
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15 if (parse_args(argbulk, 1, 1, argv, 0) < 0)
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16 return;
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17 if (parse_hexarg(argv[0], 8, &addr) < 0) {
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18 printf("ERROR: argument must be a valid 32-bit hex address\n");
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19 return;
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20 }
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21 if (addr & 1) {
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22 printf("ERROR: unaligned address\n");
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23 return;
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24 }
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25 printf("%04X\n", *(volatile u16 *)addr);
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26 }