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331 lines
6.9 KiB
331 lines
6.9 KiB
#define _POSIX_C_SOURCE 200809L
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#include <ctype.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <strings.h>
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#include <wordexp.h>
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#include "list.h"
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#include "log.h"
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#include "stringop.h"
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static const char whitespace[] = " \f\n\r\t\v";
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void strip_whitespace(char *str) {
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size_t len = strlen(str);
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size_t start = strspn(str, whitespace);
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memmove(str, &str[start], len + 1 - start);
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if (*str) {
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for (len -= start + 1; isspace(str[len]); --len) {}
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str[len + 1] = '\0';
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}
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}
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void strip_quotes(char *str) {
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bool in_str = false;
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bool in_chr = false;
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bool escaped = false;
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char *end = strchr(str,0);
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while (*str) {
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if (*str == '\'' && !in_str && !escaped) {
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in_chr = !in_chr;
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goto shift_over;
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} else if (*str == '\"' && !in_chr && !escaped) {
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in_str = !in_str;
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goto shift_over;
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} else if (*str == '\\') {
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escaped = !escaped;
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++str;
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continue;
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}
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escaped = false;
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++str;
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continue;
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shift_over:
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memmove(str, str+1, end-- - str);
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}
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*end = '\0';
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}
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char *lenient_strcat(char *dest, const char *src) {
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if (dest && src) {
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return strcat(dest, src);
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}
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return dest;
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}
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char *lenient_strncat(char *dest, const char *src, size_t len) {
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if (dest && src) {
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return strncat(dest, src, len);
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}
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return dest;
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}
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// strcmp that also handles null pointers.
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int lenient_strcmp(const char *a, const char *b) {
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if (a == b) {
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return 0;
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} else if (!a) {
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return -1;
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} else if (!b) {
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return 1;
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} else {
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return strcmp(a, b);
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}
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}
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list_t *split_string(const char *str, const char *delims) {
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list_t *res = create_list();
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char *copy = strdup(str);
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char *token = strtok(copy, delims);
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while (token) {
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list_add(res, strdup(token));
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token = strtok(NULL, delims);
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}
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free(copy);
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return res;
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}
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char **split_args(const char *start, int *argc) {
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*argc = 0;
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int alloc = 2;
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char **argv = malloc(sizeof(char *) * alloc);
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bool in_token = false;
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bool in_string = false;
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bool in_char = false;
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bool in_brackets = false; // brackets are used for criteria
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bool escaped = false;
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const char *end = start;
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if (start) {
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while (*start) {
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if (!in_token) {
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start = (end += strspn(end, whitespace));
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in_token = true;
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}
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if (*end == '"' && !in_char && !escaped) {
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in_string = !in_string;
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} else if (*end == '\'' && !in_string && !escaped) {
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in_char = !in_char;
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} else if (*end == '[' && !in_string && !in_char && !in_brackets && !escaped) {
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in_brackets = true;
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} else if (*end == ']' && !in_string && !in_char && in_brackets && !escaped) {
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in_brackets = false;
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} else if (*end == '\\') {
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escaped = !escaped;
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} else if (*end == '\0' || (!in_string && !in_char && !in_brackets
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&& !escaped && strchr(whitespace, *end))) {
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goto add_token;
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}
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if (*end != '\\') {
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escaped = false;
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}
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++end;
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continue;
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add_token:
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if (end - start > 0) {
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char *token = malloc(end - start + 1);
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strncpy(token, start, end - start + 1);
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token[end - start] = '\0';
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argv[*argc] = token;
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if (++*argc + 1 == alloc) {
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argv = realloc(argv, (alloc *= 2) * sizeof(char *));
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}
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}
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in_token = false;
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escaped = false;
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}
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}
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argv[*argc] = NULL;
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return argv;
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}
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void free_argv(int argc, char **argv) {
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while (argc-- > 0) {
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free(argv[argc]);
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}
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free(argv);
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}
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int unescape_string(char *string) {
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/* TODO: More C string escapes */
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int len = strlen(string);
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int i;
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for (i = 0; string[i]; ++i) {
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if (string[i] == '\\') {
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switch (string[++i]) {
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case '0':
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string[i - 1] = '\0';
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return i - 1;
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case 'a':
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string[i - 1] = '\a';
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string[i] = '\0';
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break;
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case 'b':
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string[i - 1] = '\b';
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string[i] = '\0';
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break;
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case 'f':
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string[i - 1] = '\f';
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string[i] = '\0';
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break;
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case 'n':
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string[i - 1] = '\n';
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string[i] = '\0';
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break;
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case 'r':
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string[i - 1] = '\r';
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string[i] = '\0';
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break;
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case 't':
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string[i - 1] = '\t';
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string[i] = '\0';
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break;
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case 'v':
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string[i - 1] = '\v';
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string[i] = '\0';
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break;
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case '\\':
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string[i] = '\0';
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break;
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case '\'':
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string[i - 1] = '\'';
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string[i] = '\0';
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break;
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case '\"':
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string[i - 1] = '\"';
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string[i] = '\0';
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break;
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case '?':
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string[i - 1] = '?';
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string[i] = '\0';
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break;
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case 'x':
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{
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unsigned char c = 0;
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if (string[i+1] >= '0' && string[i+1] <= '9') {
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c = string[i+1] - '0';
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if (string[i+2] >= '0' && string[i+2] <= '9') {
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c *= 0x10;
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c += string[i+2] - '0';
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string[i+2] = '\0';
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}
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string[i+1] = '\0';
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}
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string[i] = '\0';
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string[i - 1] = c;
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}
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}
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}
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}
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// Shift characters over nullspaces
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int shift = 0;
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for (i = 0; i < len; ++i) {
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if (string[i] == 0) {
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shift++;
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continue;
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}
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string[i-shift] = string[i];
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}
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string[len - shift] = 0;
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return len - shift;
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}
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char *join_args(char **argv, int argc) {
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if (!sway_assert(argc > 0, "argc should be positive")) {
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return NULL;
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}
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int len = 0, i;
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for (i = 0; i < argc; ++i) {
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len += strlen(argv[i]) + 1;
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}
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char *res = malloc(len);
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len = 0;
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for (i = 0; i < argc; ++i) {
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strcpy(res + len, argv[i]);
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len += strlen(argv[i]);
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res[len++] = ' ';
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}
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res[len - 1] = '\0';
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return res;
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}
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static inline char *argsep_next_interesting(const char *src, const char *delim) {
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char *special = strpbrk(src, "\"'\\");
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char *next_delim = strpbrk(src, delim);
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if (!special) {
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return next_delim;
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}
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if (!next_delim) {
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return special;
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}
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return (next_delim < special) ? next_delim : special;
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}
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char *argsep(char **stringp, const char *delim, char *matched) {
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char *start = *stringp;
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char *end = start;
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bool in_string = false;
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bool in_char = false;
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bool escaped = false;
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char *interesting = NULL;
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while ((interesting = argsep_next_interesting(end, delim))) {
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if (escaped && interesting != end) {
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escaped = false;
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}
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if (*interesting == '"' && !in_char && !escaped) {
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in_string = !in_string;
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end = interesting + 1;
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} else if (*interesting == '\'' && !in_string && !escaped) {
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in_char = !in_char;
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end = interesting + 1;
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} else if (*interesting == '\\') {
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escaped = !escaped;
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end = interesting + 1;
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} else if (!in_string && !in_char && !escaped) {
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// We must have matched a separator
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end = interesting;
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if (matched) {
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*matched = *end;
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}
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if (end - start) {
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*(end++) = 0;
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*stringp = end;
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break;
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} else {
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end = ++start;
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}
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} else {
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end++;
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}
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}
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if (!interesting) {
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*stringp = NULL;
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if (matched) {
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*matched = '\0';
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}
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}
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return start;
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}
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bool expand_path(char **path) {
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wordexp_t p = {0};
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while (strstr(*path, " ")) {
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*path = realloc(*path, strlen(*path) + 2);
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char *ptr = strstr(*path, " ") + 1;
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memmove(ptr + 1, ptr, strlen(ptr) + 1);
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*ptr = '\\';
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}
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if (wordexp(*path, &p, 0) != 0 || p.we_wordv[0] == NULL) {
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wordfree(&p);
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return false;
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}
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free(*path);
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*path = join_args(p.we_wordv, p.we_wordc);
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wordfree(&p);
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return true;
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}
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