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Merge pull request #26974 from obsidiansystems/response-file-parsing-…
…speed cc-wrapper: improve response file parsing speed
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,84 @@ | ||
| #include <assert.h> | ||
| #include <ctype.h> | ||
| #include <stdio.h> | ||
| #include <stdlib.h> | ||
| #include <string.h> | ||
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| typedef struct { char *data; size_t len, cap; } String; | ||
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| void resize(String *s, size_t len) { | ||
| s->len = len; | ||
| if (s->cap < s->len) { | ||
| s->cap = s->len * 2; | ||
| s->data = (char *)realloc(s->data, s->cap); | ||
| assert(s->data); | ||
| } | ||
| } | ||
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| void append(String *s, const char *data, size_t len) { | ||
| resize(s, s->len + len); | ||
| memcpy(s->data + s->len - len, data, len); | ||
| } | ||
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| typedef enum { space = 0, other = 1, backslash = 2, apostrophe = 3, quotation_mark = 4 } CharClass; | ||
| typedef enum { outside, unq, unq_esc, sq, sq_esc, dq, dq_esc } State; | ||
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| // current State -> CharClass -> next State | ||
| const State transitions[][5] = { | ||
| [outside] = {outside, unq, unq_esc, sq, dq}, | ||
| [unq] = {outside, unq, unq_esc, sq, dq}, | ||
| [unq_esc] = {unq, unq, unq, unq, unq}, | ||
| [sq] = {sq, sq, sq_esc, unq, sq}, | ||
| [sq_esc] = {sq, sq, sq, sq, sq}, | ||
| [dq] = {dq, dq, dq_esc, dq, unq}, | ||
| [dq_esc] = {dq, dq, dq, dq, dq}, | ||
| }; | ||
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| CharClass charClass(int c) { | ||
| return c == '\\' ? backslash : c == '\'' ? apostrophe : c == '"' ? quotation_mark : | ||
| isspace(c) ? space : other; | ||
| } | ||
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| // expandArg writes NULL-terminated expansions of `arg', a NULL-terminated | ||
| // string, to stdout. If arg does not begin with `@' or does not refer to a | ||
| // file, it is written as is. Otherwise the contents of the file are | ||
| // recursively expanded. On unexpected EOF in malformed response files an | ||
| // incomplete final argument is written, even if it is empty, to parse like GCC. | ||
| void expandArg(String *arg) { | ||
| FILE *f; | ||
| if (arg->data[0] != '@' || !(f = fopen(&arg->data[1], "r"))) { | ||
| fwrite(arg->data, 1, arg->len, stdout); | ||
| return; | ||
| } | ||
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| resize(arg, 0); | ||
| State cur = outside; | ||
| int c; | ||
| do { | ||
| c = fgetc(f); | ||
| State next = transitions[cur][charClass(c)]; | ||
| if ((cur == unq && next == outside) || (cur != outside && c == EOF)) { | ||
| append(arg, "", 1); | ||
| expandArg(arg); | ||
| resize(arg, 0); | ||
| } else if (cur == unq_esc || cur == sq_esc || cur == dq_esc || | ||
| (cur == outside ? next == unq : cur == next)) { | ||
| char s = c; | ||
| append(arg, &s, 1); | ||
| } | ||
| cur = next; | ||
| } while (c != EOF); | ||
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| fclose(f); | ||
| } | ||
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| int main(int argc, char **argv) { | ||
| String arg = { 0 }; | ||
| while (*++argv) { | ||
| resize(&arg, 0); | ||
| append(&arg, *argv, strlen(*argv) + 1); | ||
| expandArg(&arg); | ||
| } | ||
| free(arg.data); | ||
| return EXIT_SUCCESS; | ||
| } |
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