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strliteral.c
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strliteral.c
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#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <string.h>
static void make_identifier(char *str) {
char c;
size_t i;
for (i = 0; (c = str[i]) != '\0'; ++i) {
if (!(
(c >= '0' && c <= '9') ||
(c >= 'a' && c <= 'z') ||
(c >= 'A' && c <= 'Z'))) {
str[i] = '_';
}
}
}
/* strdup is actually a POSIX thing, not a C thing, so don't use it */
static char *dupstr(char *str) {
size_t len = strlen(str);
char *dup = malloc(len + 1);
strcpy(dup, str);
dup[len] = '\0';
return dup;
}
static void usage(const char *argv0) {
printf("Usage: %s [options] [infile] [outfile]\n", argv0);
puts(
"Options:\n"
"\t-h, --help Show this help text\n"
"\t--no-const Output mutable variables instead of consts\n"
"\t--always-escape Unconditionally escape every character\n"
"\t-l, --line-length <length> Specify how long a line should be\n"
"\t-i, --ident <ident> Overwrite the identifier instead of using the file name");
}
int main(int argc, char **argv) {
int ret = 0;
char *inp = "stdin", *outp = "stdout";
FILE *inf = stdin, *outf = stdout;
char *ident = NULL;
char *buffer = NULL;
char *conststr = "const ";
int alwaysescape = 0;
size_t maxlength = 100;
int argidx;
for (argidx = 1; argidx < argc; ++argidx) {
char *arg = argv[argidx];
if (arg[0] != '-' || strcmp(arg, "--") == 0) {
break;
}
if (strcmp(arg, "--help") == 0 || strcmp(arg, "-h") == 0) {
usage(argv[0]);
goto exit;
} else if (strcmp(arg, "--no-const") == 0) {
conststr = "";
} else if (strcmp(arg, "--always-escape") == 0) {
alwaysescape = 1;
} else if (strcmp(arg, "--line-length") == 0 || strcmp(arg, "-l") == 0) {
if (argidx + 1 >= argc) {
fprintf(stderr, "%s requires an argument\n", arg);
goto fail;
}
maxlength = (size_t)atoi(argv[++argidx]);
} else if (strcmp(arg, "--ident") == 0 || strcmp(arg, "-i") == 0) {
if (argidx + 1 >= argc) {
fprintf(stderr, "%s requires an argument\n", arg);
goto fail;
}
ident = dupstr(argv[++argidx]);
make_identifier(ident);
} else {
fprintf(stderr, "Unknown option: %s\n", arg);
usage(argv[0]);
goto fail;
}
}
if (argc - argidx == 0) {
if (ident == NULL) {
ident = dupstr("stdin");
}
} else if (argc - argidx == 1 || argc - argidx == 2) {
inp = argv[argidx];
inf = fopen(inp, "rb");
if (inf == NULL) {
perror(inp);
goto fail;
}
if (ident == NULL) {
ident = dupstr(inp);
make_identifier(ident);
}
if (argc - argidx == 2) {
outp = argv[argidx + 1];
outf = fopen(outp, "w");
if (outf == NULL) {
perror(outp);
goto fail;
}
}
} else {
fprintf(stderr, "Unexpected number of non-option arguments: %i\n", argc - argidx);
goto fail;
}
if (fprintf(outf, "%sunsigned char %s[] =\n\t\"", conststr, ident) < 0) {
perror("write d");
goto fail;
}
buffer = malloc(maxlength + 4);
size_t linechar = 0;
size_t length = 0;
int c;
while ((c = fgetc(inf)) != EOF) {
if (alwaysescape) {
buffer[linechar++] = '\\';
buffer[linechar++] = '0' + ((c & 0700) >> 6);
buffer[linechar++] = '0' + ((c & 0070) >> 3);
buffer[linechar++] = '0' + ((c & 0007) >> 0);
} else if (c >= 32 && c <= 126 && c != '"' && c != '\\' && c != '?' && c != ':' && c != '%') {
buffer[linechar++] = (char)c;
} else if (c == '\r') {
buffer[linechar++] = '\\';
buffer[linechar++] = 'r';
} else if (c == '\n') {
buffer[linechar++] = '\\';
buffer[linechar++] = 'n';
} else if (c == '\t') {
buffer[linechar++] = '\\';
buffer[linechar++] = 't';
} else if (c == '\"') {
buffer[linechar++] = '\\';
buffer[linechar++] = '"';
} else if (c == '\\') {
buffer[linechar++] = '\\';
buffer[linechar++] = '\\';
} else {
buffer[linechar++] = '\\';
buffer[linechar++] = '0' + ((c & 0700) >> 6);
buffer[linechar++] = '0' + ((c & 0070) >> 3);
buffer[linechar++] = '0' + ((c & 0007) >> 0);
}
length += 1;
if (linechar >= maxlength) {
if (fwrite(buffer, 1, linechar, outf) != linechar) {
perror("write");
goto fail;
}
if (fwrite("\"\n\t\"", 1, 4, outf) != 4) {
perror("write");
goto fail;
}
linechar = 0;
}
}
if (linechar >= 1) {
if (fwrite(buffer, 1, linechar, outf) != linechar) {
perror("write b");
goto fail;
}
}
if (ferror(inf)) {
perror("read");
goto fail;
}
if (fprintf(outf, "\";\n%sunsigned int %s_len = %u;\n",
conststr, ident, (unsigned int)length) < 0) {
perror("write c");
goto fail;
}
if (fclose(inf) == EOF) {
perror("close");
goto fail;
}
if (fclose(outf) == EOF) {
perror("close");
goto fail;
}
exit:
free(ident);
free(buffer);
return ret;
fail:
ret = 1;
goto exit;
}