mirror of
https://github.com/clearlinux/graphene.git
synced 2026-09-06 13:51:28 +00:00
Yunjong Jeong
5c3b6929df
Even though the SysV ABI does not specify the order of argv strings, some applications (notably Node.js's libuv) assume the compact encoding of argv where (1) all strings are located adjacently and (2) in increasing order. This commit reorders argv strings in the initial user stack in this way.
28 lines
751 B
C
28 lines
751 B
C
#include <stdio.h>
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#include <string.h>
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int main(int argc, const char** argv, const char** envp) {
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printf("User Program Started\n");
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printf("# of Arguments: %d\n", argc);
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for (int i = 0; i < argc; i++) {
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printf("argv[%d] = %s\n", i, argv[i]);
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}
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/* Make sure argv strings follow the compact encoding where (1) all strings
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are located adjacently and (2) in increasing order. */
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size_t sum_len = 0;
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for (int i = 0; i < argc; i++) {
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sum_len += strlen(argv[i]) + 1;
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}
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size_t chunk_len = argv[argc - 1] + strlen(argv[argc - 1]) - argv[0];
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if (sum_len != chunk_len + 1) {
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printf("argv strings are not adjacent or not in increasing order\n");
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return 1;
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}
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return 0;
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}
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